diff --git a/boa/src/builtins/array/mod.rs b/boa/src/builtins/array/mod.rs
index 1a4bebaa44f..0615c51a0a5 100644
--- a/boa/src/builtins/array/mod.rs
+++ b/boa/src/builtins/array/mod.rs
@@ -25,6 +25,8 @@ use crate::{
 };
 use std::cmp::{max, min, Ordering};
 
+use super::JsArgs;
+
 /// JavaScript `Array` built-in implementation.
 #[derive(Debug, Clone, Copy)]
 pub(crate) struct Array;
@@ -689,8 +691,8 @@ impl Array {
                 // i. Let kValue be ? Get(O, Pk).
                 let k_value = o.get(pk, context)?;
                 // ii. Perform ? Call(callbackfn, thisArg, « kValue, 𝔽(k), O »).
-                let this_arg = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
-                callback.call(&this_arg, &[k_value, k.into(), o.clone().into()], context)?;
+                let this_arg = args.get_or_undefined(1);
+                callback.call(this_arg, &[k_value, k.into(), o.clone().into()], context)?;
             }
             // d. Set k to k + 1.
         }
@@ -1024,7 +1026,7 @@ impl Array {
             return context.throw_type_error("Array.prototype.every: callback is not callable");
         };
 
-        let this_arg = args.get(1).cloned().unwrap_or_default();
+        let this_arg = args.get_or_undefined(1);
 
         // 4. Let k be 0.
         // 5. Repeat, while k < len,
@@ -1038,7 +1040,7 @@ impl Array {
                 let k_value = o.get(k, context)?;
                 // ii. Let testResult be ! ToBoolean(? Call(callbackfn, thisArg, « kValue, 𝔽(k), O »)).
                 let test_result = callback
-                    .call(&this_arg, &[k_value, k.into(), o.clone().into()], context)?
+                    .call(this_arg, &[k_value, k.into(), o.clone().into()], context)?
                     .to_boolean();
                 // iii. If testResult is false, return false.
                 if !test_result {
@@ -1072,7 +1074,7 @@ impl Array {
         // 2. Let len be ? LengthOfArrayLike(O).
         let len = o.length_of_array_like(context)?;
         // 3. If IsCallable(callbackfn) is false, throw a TypeError exception.
-        let callback = args.get(0).cloned().unwrap_or_default();
+        let callback = args.get_or_undefined(0);
         if !callback.is_function() {
             return context.throw_type_error("Array.prototype.map: Callbackfn is not callable");
         }
@@ -1080,7 +1082,7 @@ impl Array {
         // 4. Let A be ? ArraySpeciesCreate(O, len).
         let a = Self::array_species_create(&o, len, context)?;
 
-        let this_arg = args.get(1).cloned().unwrap_or_default();
+        let this_arg = args.get_or_undefined(1);
 
         // 5. Let k be 0.
         // 6. Repeat, while k < len,
@@ -1094,7 +1096,7 @@ impl Array {
                 let k_value = o.get(k, context)?;
                 // ii. Let mappedValue be ? Call(callbackfn, thisArg, « kValue, 𝔽(k), O »).
                 let mapped_value =
-                    context.call(&callback, &this_arg, &[k_value, k.into(), this.into()])?;
+                    context.call(callback, this_arg, &[k_value, k.into(), this.into()])?;
                 // iii. Perform ? CreateDataPropertyOrThrow(A, Pk, mappedValue).
                 a.create_data_property_or_throw(k, mapped_value, context)?;
             }
@@ -1158,7 +1160,7 @@ impl Array {
             }
         };
 
-        let search_element = args.get(0).cloned().unwrap_or_default();
+        let search_element = args.get_or_undefined(0);
 
         // 10. Repeat, while k < len,
         while k < len {
@@ -1234,7 +1236,7 @@ impl Array {
             IntegerOrInfinity::Integer(n) => len + n,
         };
 
-        let search_element = args.get(0).cloned().unwrap_or_default();
+        let search_element = args.get_or_undefined(0);
 
         // 8. Repeat, while k ≥ 0,
         while k >= 0 {
@@ -1246,7 +1248,7 @@ impl Array {
                 let element_k = o.get(k, context)?;
                 // ii. Let same be IsStrictlyEqual(searchElement, elementK).
                 // iii. If same is true, return 𝔽(k).
-                if JsValue::strict_equals(&search_element, &element_k) {
+                if JsValue::strict_equals(search_element, &element_k) {
                     return Ok(JsValue::new(k));
                 }
             }
@@ -1288,7 +1290,7 @@ impl Array {
             }
         };
 
-        let this_arg = args.get(1).cloned().unwrap_or_default();
+        let this_arg = args.get_or_undefined(1);
 
         // 4. Let k be 0.
         let mut k = 0;
@@ -1301,7 +1303,7 @@ impl Array {
             // c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
             let test_result = predicate
                 .call(
-                    &this_arg,
+                    this_arg,
                     &[k_value.clone(), k.into(), o.clone().into()],
                     context,
                 )?
@@ -1349,7 +1351,7 @@ impl Array {
             }
         };
 
-        let this_arg = args.get(1).cloned().unwrap_or_default();
+        let this_arg = args.get_or_undefined(1);
 
         // 4. Let k be 0.
         let mut k = 0;
@@ -1361,7 +1363,7 @@ impl Array {
             let k_value = o.get(pk, context)?;
             // c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
             let test_result = predicate
-                .call(&this_arg, &[k_value, k.into(), o.clone().into()], context)?
+                .call(this_arg, &[k_value, k.into(), o.clone().into()], context)?
                 .to_boolean();
             // d. If testResult is true, return 𝔽(k).
             if test_result {
@@ -1453,7 +1455,7 @@ impl Array {
         let source_len = o.length_of_array_like(context)?;
 
         // 3. If ! IsCallable(mapperFunction) is false, throw a TypeError exception.
-        let mapper_function = args.get(0).cloned().unwrap_or_default();
+        let mapper_function = args.get_or_undefined(0);
         if !mapper_function.is_function() {
             return context.throw_type_error("flatMap mapper function is not callable");
         }
@@ -1469,7 +1471,7 @@ impl Array {
             0,
             1,
             Some(mapper_function.as_object().unwrap()),
-            &args.get(1).cloned().unwrap_or_default(),
+            args.get_or_undefined(1),
             context,
         )?;
 
@@ -1624,7 +1626,7 @@ impl Array {
         // 10. Else, let final be min(relativeEnd, len).
         let final_ = Self::get_relative_end(context, args.get(2), len)?;
 
-        let value = args.get(0).cloned().unwrap_or_default();
+        let value = args.get_or_undefined(0);
 
         // 11. Repeat, while k < final,
         while k < final_ {
@@ -1695,14 +1697,14 @@ impl Array {
             }
         }
 
-        let search_element = args.get(0).cloned().unwrap_or_default();
+        let search_element = args.get_or_undefined(0);
 
         // 10. Repeat, while k < len,
         while k < len {
             // a. Let elementK be ? Get(O, ! ToString(𝔽(k))).
             let element_k = o.get(k, context)?;
             // b. If SameValueZero(searchElement, elementK) is true, return true.
-            if JsValue::same_value_zero(&search_element, &element_k) {
+            if JsValue::same_value_zero(search_element, &element_k) {
                 return Ok(JsValue::new(true));
             }
             // c. Set k to k + 1.
@@ -1992,7 +1994,7 @@ impl Array {
                     "missing argument 0 when calling function Array.prototype.filter",
                 )
             })?;
-        let this_val = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
+        let this_arg = args.get_or_undefined(1);
 
         if !callback.is_callable() {
             return context.throw_type_error("the callback must be callable");
@@ -2016,7 +2018,7 @@ impl Array {
                 let args = [element.clone(), JsValue::new(idx), JsValue::new(o.clone())];
 
                 // ii. Let selected be ! ToBoolean(? Call(callbackfn, thisArg, « kValue, 𝔽(k), O »)).
-                let selected = callback.call(&this_val, &args, context)?.to_boolean();
+                let selected = callback.call(this_arg, &args, context)?.to_boolean();
 
                 // iii. If selected is true, then
                 if selected {
@@ -2078,9 +2080,9 @@ impl Array {
                 // i. Let kValue be ? Get(O, Pk).
                 let k_value = o.get(k, context)?;
                 // ii. Let testResult be ! ToBoolean(? Call(callbackfn, thisArg, « kValue, 𝔽(k), O »)).
-                let this_arg = args.get(1).cloned().unwrap_or_default();
+                let this_arg = args.get_or_undefined(1);
                 let test_result = callback
-                    .call(&this_arg, &[k_value, k.into(), o.clone().into()], context)?
+                    .call(this_arg, &[k_value, k.into(), o.clone().into()], context)?
                     .to_boolean();
                 // iii. If testResult is true, return true.
                 if test_result {
diff --git a/boa/src/builtins/bigint/mod.rs b/boa/src/builtins/bigint/mod.rs
index 1e9a1553fff..499650f9e2a 100644
--- a/boa/src/builtins/bigint/mod.rs
+++ b/boa/src/builtins/bigint/mod.rs
@@ -13,8 +13,12 @@
 //! [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt
 
 use crate::{
-    builtins::BuiltIn, object::ConstructorBuilder, property::Attribute, symbol::WellKnownSymbols,
-    value::IntegerOrInfinity, BoaProfiler, Context, JsBigInt, JsResult, JsValue,
+    builtins::{BuiltIn, JsArgs},
+    object::ConstructorBuilder,
+    property::Attribute,
+    symbol::WellKnownSymbols,
+    value::IntegerOrInfinity,
+    BoaProfiler, Context, JsBigInt, JsResult, JsValue,
 };
 #[cfg(test)]
 mod tests;
@@ -131,7 +135,7 @@ impl BigInt {
         // 1. Let x be ? thisBigIntValue(this value).
         let x = Self::this_bigint_value(this, context)?;
 
-        let radix = args.get(0).cloned().unwrap_or_default();
+        let radix = args.get_or_undefined(0);
 
         // 2. If radix is undefined, let radixMV be 10.
         let radix_mv = if radix.is_undefined() {
@@ -234,10 +238,8 @@ impl BigInt {
     fn calculate_as_uint_n(args: &[JsValue], context: &mut Context) -> JsResult<(JsBigInt, u32)> {
         use std::convert::TryFrom;
 
-        let undefined_value = JsValue::undefined();
-
-        let bits_arg = args.get(0).unwrap_or(&undefined_value);
-        let bigint_arg = args.get(1).unwrap_or(&undefined_value);
+        let bits_arg = args.get_or_undefined(0);
+        let bigint_arg = args.get_or_undefined(1);
 
         let bits = bits_arg.to_index(context)?;
         let bits = u32::try_from(bits).unwrap_or(u32::MAX);
diff --git a/boa/src/builtins/console/mod.rs b/boa/src/builtins/console/mod.rs
index 95b2561738f..e6c8abd586c 100644
--- a/boa/src/builtins/console/mod.rs
+++ b/boa/src/builtins/console/mod.rs
@@ -17,7 +17,7 @@
 mod tests;
 
 use crate::{
-    builtins::BuiltIn,
+    builtins::{BuiltIn, JsArgs},
     object::ObjectInitializer,
     property::Attribute,
     value::{display::display_obj, JsValue},
@@ -90,7 +90,7 @@ pub fn formatter(data: &[JsValue], context: &mut Context) -> JsResult<String> {
                         }
                         /* object, FIXME: how to render this properly? */
                         'o' | 'O' => {
-                            let arg = data.get(arg_index).cloned().unwrap_or_default();
+                            let arg = data.get_or_undefined(arg_index);
                             formatted.push_str(&format!("{}", arg.display()));
                             arg_index += 1
                         }
@@ -564,9 +564,8 @@ impl Console {
     /// [spec]: https://console.spec.whatwg.org/#dir
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/console/dir
     pub(crate) fn dir(_: &JsValue, args: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let undefined = JsValue::undefined();
         logger(
-            LogMessage::Info(display_obj(args.get(0).unwrap_or(&undefined), true)),
+            LogMessage::Info(display_obj(args.get_or_undefined(0), true)),
             context.console(),
         );
 
diff --git a/boa/src/builtins/date/mod.rs b/boa/src/builtins/date/mod.rs
index fb056511e8e..a3be0770e6b 100644
--- a/boa/src/builtins/date/mod.rs
+++ b/boa/src/builtins/date/mod.rs
@@ -13,6 +13,8 @@ use crate::{
 use chrono::{prelude::*, Duration, LocalResult};
 use std::fmt::Display;
 
+use super::JsArgs;
+
 /// The number of nanoseconds in a millisecond.
 const NANOS_PER_MS: i64 = 1_000_000;
 /// The number of milliseconds in an hour.
@@ -523,7 +525,7 @@ impl Date {
             return context.throw_type_error("Date.prototype[@@toPrimitive] called on non object");
         };
 
-        let hint = args.get(0).cloned().unwrap_or_default();
+        let hint = args.get_or_undefined(0);
 
         let try_first = match hint.as_string().map(|s| s.as_str()) {
             // 3. If hint is "string" or "default", then
diff --git a/boa/src/builtins/function/mod.rs b/boa/src/builtins/function/mod.rs
index 2df399cc2fa..64f63ed8685 100644
--- a/boa/src/builtins/function/mod.rs
+++ b/boa/src/builtins/function/mod.rs
@@ -26,6 +26,8 @@ use dyn_clone::DynClone;
 use sealed::Sealed;
 use std::fmt::{self, Debug};
 
+use super::JsArgs;
+
 #[cfg(test)]
 mod tests;
 
@@ -340,10 +342,10 @@ impl BuiltInFunctionObject {
         if !this.is_function() {
             return context.throw_type_error(format!("{} is not a function", this.display()));
         }
-        let this_arg: JsValue = args.get(0).cloned().unwrap_or_default();
+        let this_arg = args.get_or_undefined(0);
         // TODO?: 3. Perform PrepareForTailCall
         let start = if !args.is_empty() { 1 } else { 0 };
-        context.call(this, &this_arg, &args[start..])
+        context.call(this, this_arg, &args[start..])
     }
 
     /// `Function.prototype.apply`
@@ -361,15 +363,15 @@ impl BuiltInFunctionObject {
         if !this.is_function() {
             return context.throw_type_error(format!("{} is not a function", this.display()));
         }
-        let this_arg = args.get(0).cloned().unwrap_or_default();
-        let arg_array = args.get(1).cloned().unwrap_or_default();
+        let this_arg = args.get_or_undefined(0);
+        let arg_array = args.get_or_undefined(1);
         if arg_array.is_null_or_undefined() {
             // TODO?: 3.a. PrepareForTailCall
-            return context.call(this, &this_arg, &[]);
+            return context.call(this, this_arg, &[]);
         }
         let arg_list = arg_array.create_list_from_array_like(&[], context)?;
         // TODO?: 5. PrepareForTailCall
-        context.call(this, &this_arg, &arg_list)
+        context.call(this, this_arg, &arg_list)
     }
 }
 
diff --git a/boa/src/builtins/json/mod.rs b/boa/src/builtins/json/mod.rs
index ed4d3e97d13..493c19b0e18 100644
--- a/boa/src/builtins/json/mod.rs
+++ b/boa/src/builtins/json/mod.rs
@@ -26,6 +26,8 @@ use crate::{
 };
 use serde_json::{self, Value as JSONValue};
 
+use super::JsArgs;
+
 #[cfg(test)]
 mod tests;
 
@@ -156,7 +158,7 @@ impl Json {
         let mut property_list = None;
         let mut replacer_function = None;
 
-        let replacer = args.get(1).cloned().unwrap_or_default();
+        let replacer = args.get_or_undefined(1);
 
         // 4. If Type(replacer) is Object, then
         if let Some(replacer_obj) = replacer.as_object() {
@@ -212,7 +214,7 @@ impl Json {
             }
         }
 
-        let mut space = args.get(2).cloned().unwrap_or_default();
+        let mut space = args.get_or_undefined(2).clone();
 
         // 5. If Type(space) is Object, then
         if let Some(space_obj) = space.as_object() {
@@ -264,7 +266,7 @@ impl Json {
 
         // 10. Perform ! CreateDataPropertyOrThrow(wrapper, the empty String, value).
         wrapper
-            .create_data_property_or_throw("", args.get(0).cloned().unwrap_or_default(), context)
+            .create_data_property_or_throw("", args.get_or_undefined(0).clone(), context)
             .expect("CreateDataPropertyOrThrow should never fail here");
 
         // 11. Let state be the Record { [[ReplacerFunction]]: ReplacerFunction, [[Stack]]: stack, [[Indent]]: indent, [[Gap]]: gap, [[PropertyList]]: PropertyList }.
diff --git a/boa/src/builtins/map/mod.rs b/boa/src/builtins/map/mod.rs
index 2572de182d6..2dd3333256a 100644
--- a/boa/src/builtins/map/mod.rs
+++ b/boa/src/builtins/map/mod.rs
@@ -26,6 +26,8 @@ use map_iterator::MapIterator;
 
 use self::ordered_map::MapLock;
 
+use super::JsArgs;
+
 pub mod ordered_map;
 #[cfg(test)]
 mod tests;
@@ -245,15 +247,12 @@ impl Map {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let (key, value) = match args.len() {
-            0 => (JsValue::undefined(), JsValue::undefined()),
-            1 => (args[0].clone(), JsValue::undefined()),
-            _ => (args[0].clone(), args[1].clone()),
-        };
+        let key = args.get_or_undefined(0);
+        let value = args.get_or_undefined(1);
 
         let size = if let Some(object) = this.as_object() {
             if let Some(map) = object.borrow_mut().as_map_mut() {
-                map.insert(key, value);
+                map.insert(key.clone(), value.clone());
                 map.len()
             } else {
                 return Err(context.construct_type_error("'this' is not a Map"));
@@ -281,11 +280,11 @@ impl Map {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let key = args.get(0).cloned().unwrap_or_default();
+        let key = args.get_or_undefined(0);
 
         let (deleted, size) = if let Some(object) = this.as_object() {
             if let Some(map) = object.borrow_mut().as_map_mut() {
-                let deleted = map.remove(&key).is_some();
+                let deleted = map.remove(key).is_some();
                 (deleted, map.len())
             } else {
                 return Err(context.construct_type_error("'this' is not a Map"));
@@ -312,12 +311,12 @@ impl Map {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let key = args.get(0).cloned().unwrap_or_default();
+        let key = args.get_or_undefined(0);
 
         if let JsValue::Object(ref object) = this {
             let object = object.borrow();
             if let Some(map) = object.as_map_ref() {
-                return Ok(if let Some(result) = map.get(&key) {
+                return Ok(if let Some(result) = map.get(key) {
                     result.clone()
                 } else {
                     JsValue::undefined()
@@ -361,12 +360,12 @@ impl Map {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let key = args.get(0).cloned().unwrap_or_default();
+        let key = args.get_or_undefined(0);
 
         if let JsValue::Object(ref object) = this {
             let object = object.borrow();
             if let Some(map) = object.as_map_ref() {
-                return Ok(map.contains_key(&key).into());
+                return Ok(map.contains_key(key).into());
             }
         }
 
@@ -393,7 +392,7 @@ impl Map {
         }
 
         let callback_arg = &args[0];
-        let this_arg = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
+        let this_arg = args.get_or_undefined(1);
 
         let mut index = 0;
 
@@ -416,7 +415,7 @@ impl Map {
             };
 
             if let Some(arguments) = arguments {
-                context.call(callback_arg, &this_arg, &arguments)?;
+                context.call(callback_arg, this_arg, &arguments)?;
             }
 
             index += 1;
diff --git a/boa/src/builtins/mod.rs b/boa/src/builtins/mod.rs
index bf921f53aba..e9f17db73ba 100644
--- a/boa/src/builtins/mod.rs
+++ b/boa/src/builtins/mod.rs
@@ -112,3 +112,25 @@ pub fn init(context: &mut Context) {
         global_object.borrow_mut().insert(name, property);
     }
 }
+
+pub trait JsArgs {
+    /// Utility function to `get` a parameter from
+    /// a `[JsValue]` or default to `JsValue::Undefined`
+    /// if `get` returns `None`.
+    ///
+    /// Call this if you are thinking of calling something similar to
+    /// `args.get(n).cloned().unwrap_or_default()` or
+    /// `args.get(n).unwrap_or(&undefined)`.
+    ///
+    /// This returns a reference for efficiency, in case
+    /// you only need to call methods of `JsValue`, so
+    /// try to minimize calling `clone`.
+    fn get_or_undefined(&self, index: usize) -> &JsValue;
+}
+
+impl JsArgs for [JsValue] {
+    fn get_or_undefined(&self, index: usize) -> &JsValue {
+        const UNDEFINED: &JsValue = &JsValue::Undefined;
+        self.get(index).unwrap_or(UNDEFINED)
+    }
+}
diff --git a/boa/src/builtins/number/mod.rs b/boa/src/builtins/number/mod.rs
index 5349865cd07..f44290ab2e1 100644
--- a/boa/src/builtins/number/mod.rs
+++ b/boa/src/builtins/number/mod.rs
@@ -13,8 +13,8 @@
 //! [spec]: https://tc39.es/ecma262/#sec-number-object
 //! [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number
 
-use super::function::make_builtin_fn;
 use super::string::is_trimmable_whitespace;
+use super::{function::make_builtin_fn, JsArgs};
 use crate::{
     builtins::BuiltIn,
     object::{ConstructorBuilder, ObjectData, PROTOTYPE},
@@ -392,12 +392,12 @@ impl Number {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let precision = args.get(0).cloned().unwrap_or_default();
+        let precision = args.get_or_undefined(0);
 
         // 1 & 6
         let mut this_num = Self::this_number_value(this, context)?;
         // 2
-        if precision == JsValue::undefined() {
+        if precision.is_undefined() {
             return Self::to_string(this, &[], context);
         }
 
@@ -720,7 +720,7 @@ impl Number {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        if let (Some(val), radix) = (args.get(0), args.get(1)) {
+        if let (Some(val), radix) = (args.get(0), args.get_or_undefined(1)) {
             // 1. Let inputString be ? ToString(string).
             let input_string = val.to_string(context)?;
 
@@ -745,7 +745,7 @@ impl Number {
             }
 
             // 6. Let R be ℝ(? ToInt32(radix)).
-            let mut var_r = radix.cloned().unwrap_or_default().to_i32(context)?;
+            let mut var_r = radix.to_i32(context)?;
 
             // 7. Let stripPrefix be true.
             let mut strip_prefix = true;
diff --git a/boa/src/builtins/object/mod.rs b/boa/src/builtins/object/mod.rs
index d199647aafc..e1ca18c874e 100644
--- a/boa/src/builtins/object/mod.rs
+++ b/boa/src/builtins/object/mod.rs
@@ -14,7 +14,7 @@
 //! [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object
 
 use crate::{
-    builtins::BuiltIn,
+    builtins::{BuiltIn, JsArgs},
     object::{
         ConstructorBuilder, IntegrityLevel, JsObject, Object as BuiltinObject, ObjectData,
         ObjectInitializer, ObjectKind, PROTOTYPE,
@@ -135,12 +135,12 @@ impl Object {
     /// [spec]: https://tc39.es/ecma262/#sec-object.create
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/create
     pub fn create(_: &JsValue, args: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let prototype = args.get(0).cloned().unwrap_or_else(JsValue::undefined);
-        let properties = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
+        let prototype = args.get_or_undefined(0);
+        let properties = args.get_or_undefined(1);
 
         let obj = match prototype {
             JsValue::Object(_) | JsValue::Null => JsObject::new(BuiltinObject::with_prototype(
-                prototype,
+                prototype.clone(),
                 ObjectData::ordinary(),
             )),
             _ => {
@@ -152,7 +152,7 @@ impl Object {
         };
 
         if !properties.is_undefined() {
-            object_define_properties(&obj, properties, context)?;
+            object_define_properties(&obj, properties.clone(), context)?;
             return Ok(obj.into());
         }
 
@@ -174,10 +174,7 @@ impl Object {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let object = args
-            .get(0)
-            .unwrap_or(&JsValue::undefined())
-            .to_object(context)?;
+        let object = args.get_or_undefined(0).to_object(context)?;
         if let Some(key) = args.get(1) {
             let key = key.to_property_key(context)?;
 
@@ -276,10 +273,10 @@ impl Object {
 
     /// Uses the SameValue algorithm to check equality of objects
     pub fn is(_: &JsValue, args: &[JsValue], _: &mut Context) -> JsResult<JsValue> {
-        let x = args.get(0).cloned().unwrap_or_else(JsValue::undefined);
-        let y = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
+        let x = args.get_or_undefined(0);
+        let y = args.get_or_undefined(1);
 
-        Ok(JsValue::same_value(&x, &y).into())
+        Ok(JsValue::same_value(x, y).into())
     }
 
     /// Get the `prototype` of an object.
@@ -319,7 +316,7 @@ impl Object {
             .clone();
 
         // 2. If Type(proto) is neither Object nor Null, throw a TypeError exception.
-        let proto = args.get(1).cloned().unwrap_or_default();
+        let proto = args.get_or_undefined(1);
         if !matches!(proto.get_type(), Type::Object | Type::Null) {
             return ctx.throw_type_error(format!(
                 "expected an object or null, got {}",
@@ -336,7 +333,7 @@ impl Object {
         let status = obj
             .as_object()
             .expect("obj was not an object")
-            .__set_prototype_of__(proto, ctx)?;
+            .__set_prototype_of__(proto.clone(), ctx)?;
 
         // 5. If status is false, throw a TypeError exception.
         if !status {
@@ -362,11 +359,11 @@ impl Object {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let undefined = JsValue::undefined();
-        let mut v = args.get(0).unwrap_or(&undefined).clone();
+        let v = args.get_or_undefined(0);
         if !v.is_object() {
             return Ok(JsValue::new(false));
         }
+        let mut v = v.clone();
         let o = JsValue::new(this.to_object(context)?);
         loop {
             v = Self::get_prototype_of(this, &[v], context)?;
@@ -385,7 +382,7 @@ impl Object {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let object = args.get(0).cloned().unwrap_or_else(JsValue::undefined);
+        let object = args.get_or_undefined(0);
         if let Some(object) = object.as_object() {
             let key = args
                 .get(1)
@@ -419,12 +416,12 @@ impl Object {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let arg = args.get(0).cloned().unwrap_or_default();
+        let arg = args.get_or_undefined(0);
         let arg_obj = arg.as_object();
         if let Some(obj) = arg_obj {
-            let props = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
-            object_define_properties(&obj, props, context)?;
-            Ok(arg)
+            let props = args.get_or_undefined(1);
+            object_define_properties(&obj, props.clone(), context)?;
+            Ok(arg.clone())
         } else {
             context.throw_type_error("Expected an object")
         }
@@ -572,11 +569,7 @@ impl Object {
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
     pub fn assign(_: &JsValue, args: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
         // 1. Let to be ? ToObject(target).
-        let to = args
-            .get(0)
-            .cloned()
-            .unwrap_or_default()
-            .to_object(context)?;
+        let to = args.get_or_undefined(0).to_object(context)?;
 
         // 2. If only one argument was passed, return to.
         if args.len() == 1 {
diff --git a/boa/src/builtins/reflect/mod.rs b/boa/src/builtins/reflect/mod.rs
index 97004609e50..c699f572bff 100644
--- a/boa/src/builtins/reflect/mod.rs
+++ b/boa/src/builtins/reflect/mod.rs
@@ -18,7 +18,7 @@ use crate::{
     BoaProfiler, Context, JsResult, JsValue,
 };
 
-use super::Array;
+use super::{Array, JsArgs};
 
 #[cfg(test)]
 mod tests;
@@ -81,14 +81,14 @@ impl Reflect {
             .get(0)
             .and_then(|v| v.as_object())
             .ok_or_else(|| context.construct_type_error("target must be a function"))?;
-        let this_arg = args.get(1).cloned().unwrap_or_default();
-        let args_list = args.get(2).cloned().unwrap_or_default();
+        let this_arg = args.get_or_undefined(1);
+        let args_list = args.get_or_undefined(2);
 
         if !target.is_callable() {
             return context.throw_type_error("target must be a function");
         }
         let args = args_list.create_list_from_array_like(&[], context)?;
-        target.call(&this_arg, &args, context)
+        target.call(this_arg, &args, context)
     }
 
     /// Calls a target function as a constructor with arguments.
@@ -108,7 +108,7 @@ impl Reflect {
             .get(0)
             .and_then(|v| v.as_object())
             .ok_or_else(|| context.construct_type_error("target must be a function"))?;
-        let args_list = args.get(1).cloned().unwrap_or_default();
+        let args_list = args.get_or_undefined(1);
 
         if !target.is_constructable() {
             return context.throw_type_error("target must be a constructor");
@@ -140,12 +140,11 @@ impl Reflect {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let undefined = JsValue::undefined();
         let target = args
             .get(0)
             .and_then(|v| v.as_object())
             .ok_or_else(|| context.construct_type_error("target must be an object"))?;
-        let key = args.get(1).unwrap_or(&undefined).to_property_key(context)?;
+        let key = args.get_or_undefined(1).to_property_key(context)?;
         let prop_desc: JsValue = args
             .get(2)
             .and_then(|v| v.as_object())
@@ -170,12 +169,11 @@ impl Reflect {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let undefined = JsValue::undefined();
         let target = args
             .get(0)
             .and_then(|v| v.as_object())
             .ok_or_else(|| context.construct_type_error("target must be an object"))?;
-        let key = args.get(1).unwrap_or(&undefined).to_property_key(context)?;
+        let key = args.get_or_undefined(1).to_property_key(context)?;
 
         Ok(target.__delete__(&key, context)?.into())
     }
@@ -189,14 +187,13 @@ impl Reflect {
     /// [spec]: https://tc39.es/ecma262/#sec-reflect.get
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/get
     pub(crate) fn get(_: &JsValue, args: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let undefined = JsValue::undefined();
         // 1. If Type(target) is not Object, throw a TypeError exception.
         let target = args
             .get(0)
             .and_then(|v| v.as_object())
             .ok_or_else(|| context.construct_type_error("target must be an object"))?;
         // 2. Let key be ? ToPropertyKey(propertyKey).
-        let key = args.get(1).unwrap_or(&undefined).to_property_key(context)?;
+        let key = args.get_or_undefined(1).to_property_key(context)?;
         // 3. If receiver is not present, then
         let receiver = if let Some(receiver) = args.get(2).cloned() {
             receiver
@@ -347,13 +344,12 @@ impl Reflect {
     /// [spec]: https://tc39.es/ecma262/#sec-reflect.set
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/set
     pub(crate) fn set(_: &JsValue, args: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let undefined = JsValue::undefined();
         let target = args
             .get(0)
             .and_then(|v| v.as_object())
             .ok_or_else(|| context.construct_type_error("target must be an object"))?;
-        let key = args.get(1).unwrap_or(&undefined).to_property_key(context)?;
-        let value = args.get(2).unwrap_or(&undefined);
+        let key = args.get_or_undefined(1).to_property_key(context)?;
+        let value = args.get_or_undefined(2);
         let receiver = if let Some(receiver) = args.get(3).cloned() {
             receiver
         } else {
@@ -377,12 +373,11 @@ impl Reflect {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let undefined = JsValue::undefined();
         let mut target = args
             .get(0)
             .and_then(|v| v.as_object())
             .ok_or_else(|| context.construct_type_error("target must be an object"))?;
-        let proto = args.get(1).unwrap_or(&undefined);
+        let proto = args.get_or_undefined(1);
         if !proto.is_null() && !proto.is_object() {
             return context.throw_type_error("proto must be an object or null");
         }
diff --git a/boa/src/builtins/regexp/mod.rs b/boa/src/builtins/regexp/mod.rs
index b51a9683fa3..719924a1092 100644
--- a/boa/src/builtins/regexp/mod.rs
+++ b/boa/src/builtins/regexp/mod.rs
@@ -23,6 +23,8 @@ use crate::{
 use regexp_string_iterator::RegExpStringIterator;
 use regress::Regex;
 
+use super::JsArgs;
+
 #[cfg(test)]
 mod tests;
 
@@ -187,8 +189,8 @@ impl RegExp {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let pattern = args.get(0).cloned().unwrap_or_else(JsValue::undefined);
-        let flags = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
+        let pattern = args.get_or_undefined(0);
+        let flags = args.get_or_undefined(1);
 
         // 1. Let patternIsRegExp be ? IsRegExp(pattern).
         let pattern_is_regexp = if let JsValue::Object(obj) = &pattern {
@@ -233,12 +235,12 @@ impl RegExp {
                     JsValue::new(regexp.original_flags.clone()),
                 )
             } else {
-                (JsValue::new(regexp.original_source.clone()), flags)
+                (JsValue::new(regexp.original_source.clone()), flags.clone())
             }
         } else {
             // a. Let P be pattern.
             // b. Let F be flags.
-            (pattern, flags)
+            (pattern.clone(), flags.clone())
         };
 
         // 7. Let O be ? RegExpAlloc(newTarget).
@@ -275,8 +277,8 @@ impl RegExp {
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-regexpinitialize
     fn initialize(this: &JsValue, args: &[JsValue], context: &mut Context) -> JsResult<JsValue> {
-        let pattern = args.get(0).cloned().unwrap_or_else(JsValue::undefined);
-        let flags = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
+        let pattern = args.get_or_undefined(0);
+        let flags = args.get_or_undefined(1);
 
         // 1. If pattern is undefined, let P be the empty String.
         // 2. Else, let P be ? ToString(pattern).
@@ -1282,7 +1284,7 @@ impl RegExp {
         let length_arg_str = arg_str.encode_utf16().count();
 
         // 5. Let functionalReplace be IsCallable(replaceValue).
-        let mut replace_value = args.get(1).cloned().unwrap_or_default();
+        let mut replace_value = args.get_or_undefined(1).clone();
         let functional_replace = replace_value.is_function();
 
         // 6. If functionalReplace is false, then
@@ -1619,7 +1621,7 @@ impl RegExp {
         let mut length_a = 0;
 
         // 13. If limit is undefined, let lim be 2^32 - 1; else let lim be ℝ(? ToUint32(limit)).
-        let limit = args.get(1).cloned().unwrap_or_default();
+        let limit = args.get_or_undefined(1);
         let lim = if limit.is_undefined() {
             u32::MAX
         } else {
diff --git a/boa/src/builtins/set/mod.rs b/boa/src/builtins/set/mod.rs
index 8dec1714aa2..0cf4b991fb5 100644
--- a/boa/src/builtins/set/mod.rs
+++ b/boa/src/builtins/set/mod.rs
@@ -22,6 +22,8 @@ use ordered_set::OrderedSet;
 pub mod set_iterator;
 use set_iterator::SetIterator;
 
+use super::JsArgs;
+
 pub mod ordered_set;
 #[cfg(test)]
 mod tests;
@@ -139,7 +141,7 @@ impl Set {
         // 3
         set.set_data(ObjectData::set(OrderedSet::default()));
 
-        let iterable = args.get(0).cloned().unwrap_or_default();
+        let iterable = args.get_or_undefined(0);
         // 4
         if iterable.is_null_or_undefined() {
             return Ok(set);
@@ -154,7 +156,7 @@ impl Set {
         }
 
         // 7
-        let iterator_record = get_iterator(context, iterable)?;
+        let iterator_record = get_iterator(context, iterable.clone())?;
 
         // 8.a
         let mut next = iterator_record.next(context)?;
@@ -206,14 +208,15 @@ impl Set {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let mut value = args.get(0).cloned().unwrap_or_default();
+        let value = args.get_or_undefined(0);
 
         if let Some(object) = this.as_object() {
             if let Some(set) = object.borrow_mut().as_set_mut() {
-                if value.as_number().map(|n| n == -0f64).unwrap_or(false) {
-                    value = JsValue::Integer(0);
-                }
-                set.add(value);
+                set.add(if value.as_number().map(|n| n == -0f64).unwrap_or(false) {
+                    JsValue::Integer(0)
+                } else {
+                    value.clone()
+                });
             } else {
                 return context.throw_type_error("'this' is not a Set");
             }
@@ -263,11 +266,11 @@ impl Set {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let value = args.get(0).cloned().unwrap_or_default();
+        let value = args.get_or_undefined(0);
 
         let res = if let Some(object) = this.as_object() {
             if let Some(set) = object.borrow_mut().as_set_mut() {
-                set.delete(&value)
+                set.delete(value)
             } else {
                 return context.throw_type_error("'this' is not a Set");
             }
@@ -332,12 +335,12 @@ impl Set {
         }
 
         let callback_arg = &args[0];
-        let this_arg = args.get(1).cloned().unwrap_or_else(JsValue::undefined);
+        let this_arg = args.get_or_undefined(1);
         // TODO: if condition should also check that we are not in strict mode
         let this_arg = if this_arg.is_undefined() {
             JsValue::Object(context.global_object())
         } else {
-            this_arg
+            this_arg.clone()
         };
 
         let mut index = 0;
@@ -380,12 +383,12 @@ impl Set {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let value = args.get(0).cloned().unwrap_or_default();
+        let value = args.get_or_undefined(0);
 
         if let JsValue::Object(ref object) = this {
             let object = object.borrow();
             if let Some(set) = object.as_set_ref() {
-                return Ok(set.contains(&value).into());
+                return Ok(set.contains(value).into());
             }
         }
 
diff --git a/boa/src/builtins/string/mod.rs b/boa/src/builtins/string/mod.rs
index 9130f8f916f..a249d7b6543 100644
--- a/boa/src/builtins/string/mod.rs
+++ b/boa/src/builtins/string/mod.rs
@@ -29,6 +29,8 @@ use std::{
 };
 use unicode_normalization::UnicodeNormalization;
 
+use super::JsArgs;
+
 pub(crate) fn code_point_at(string: JsString, position: i32) -> Option<(u32, u8, bool)> {
     let size = string.encode_utf16().count() as i32;
     if position < 0 || position >= size {
@@ -562,9 +564,9 @@ impl String {
         // Then we convert it into a Rust String by wrapping it in from_value
         let primitive_val = this.to_string(context)?;
 
-        let arg = args.get(0).cloned().unwrap_or_else(JsValue::undefined);
+        let arg = args.get_or_undefined(0);
 
-        if Self::is_regexp_object(&arg) {
+        if Self::is_regexp_object(arg) {
             context.throw_type_error(
                 "First argument to String.prototype.startsWith must not be a regular expression",
             )?;
@@ -576,12 +578,10 @@ impl String {
         let search_length = search_string.chars().count() as i32;
 
         // If less than 2 args specified, position is 'undefined', defaults to 0
-        let position = if args.len() < 2 {
-            0
+        let position = if let Some(integer) = args.get(1) {
+            integer.to_integer(context)? as i32
         } else {
-            args.get(1)
-                .expect("failed to get arg")
-                .to_integer(context)? as i32
+            0
         };
 
         let start = min(max(position, 0), length);
@@ -617,9 +617,9 @@ impl String {
         // Then we convert it into a Rust String by wrapping it in from_value
         let primitive_val = this.to_string(context)?;
 
-        let arg = args.get(0).cloned().unwrap_or_else(JsValue::undefined);
+        let arg = args.get_or_undefined(0);
 
-        if Self::is_regexp_object(&arg) {
+        if Self::is_regexp_object(arg) {
             context.throw_type_error(
                 "First argument to String.prototype.endsWith must not be a regular expression",
             )?;
@@ -632,12 +632,10 @@ impl String {
 
         // If less than 2 args specified, end_position is 'undefined', defaults to
         // length of this
-        let end_position = if args.len() < 2 {
-            length
+        let end_position = if let Some(integer) = args.get(1) {
+            integer.to_integer(context)? as i32
         } else {
-            args.get(1)
-                .expect("Could not get argument")
-                .to_integer(context)? as i32
+            length
         };
 
         let end = min(max(end_position, 0), length);
@@ -671,9 +669,9 @@ impl String {
         // Then we convert it into a Rust String by wrapping it in from_value
         let primitive_val = this.to_string(context)?;
 
-        let arg = args.get(0).cloned().unwrap_or_else(JsValue::undefined);
+        let arg = args.get_or_undefined(0);
 
-        if Self::is_regexp_object(&arg) {
+        if Self::is_regexp_object(arg) {
             context.throw_type_error(
                 "First argument to String.prototype.includes must not be a regular expression",
             )?;
@@ -684,12 +682,11 @@ impl String {
         let length = primitive_val.chars().count() as i32;
 
         // If less than 2 args specified, position is 'undefined', defaults to 0
-        let position = if args.len() < 2 {
-            0
+
+        let position = if let Some(integer) = args.get(1) {
+            integer.to_integer(context)? as i32
         } else {
-            args.get(1)
-                .expect("Could not get argument")
-                .to_integer(context)? as i32
+            0
         };
 
         let start = min(max(position, 0), length);
@@ -730,9 +727,9 @@ impl String {
         // 1. Let O be ? RequireObjectCoercible(this value).
         this.require_object_coercible(context)?;
 
-        let search_value = args.get(0).cloned().unwrap_or_default();
+        let search_value = args.get_or_undefined(0);
 
-        let replace_value = args.get(1).cloned().unwrap_or_default();
+        let replace_value = args.get_or_undefined(1);
 
         // 2. If searchValue is neither undefined nor null, then
         if !search_value.is_null_or_undefined() {
@@ -747,8 +744,8 @@ impl String {
                 // i. Return ? Call(replacer, searchValue, « O, replaceValue »).
                 return context.call(
                     &replacer.into(),
-                    &search_value,
-                    &[this.clone(), replace_value],
+                    search_value,
+                    &[this.clone(), replace_value.clone()],
                 );
             }
         }
@@ -787,7 +784,7 @@ impl String {
             // a. Let replacement be ? ToString(? Call(replaceValue, undefined, « searchString, 𝔽(position), string »)).
             context
                 .call(
-                    &replace_value,
+                    replace_value,
                     &JsValue::undefined(),
                     &[search_str.into(), position.into(), this_str.clone().into()],
                 )?
@@ -846,8 +843,8 @@ impl String {
         // 1. Let O be ? RequireObjectCoercible(this value).
         let o = this.require_object_coercible(context)?;
 
-        let search_value = args.get(0).cloned().unwrap_or_default();
-        let replace_value = args.get(1).cloned().unwrap_or_default();
+        let search_value = args.get_or_undefined(0);
+        let replace_value = args.get_or_undefined(1);
 
         // 2. If searchValue is neither undefined nor null, then
         if !search_value.is_null_or_undefined() {
@@ -879,7 +876,7 @@ impl String {
             // d. If replacer is not undefined, then
             if let Some(replacer) = replacer {
                 // i. Return ? Call(replacer, searchValue, « O, replaceValue »).
-                return replacer.call(&search_value, &[o.into(), replace_value], context);
+                return replacer.call(search_value, &[o.into(), replace_value.clone()], context);
             }
         }
 
@@ -945,7 +942,7 @@ impl String {
                 // i. Let replacement be ? ToString(? Call(replaceValue, undefined, « searchString, 𝔽(p), string »)).
                 context
                     .call(
-                        &replace_value,
+                        replace_value,
                         &JsValue::undefined(),
                         &[
                             search_string.clone().into(),
@@ -1109,14 +1106,14 @@ impl String {
         let o = this.require_object_coercible(context)?;
 
         // 2. If regexp is neither undefined nor null, then
-        let regexp = args.get(0).cloned().unwrap_or_default();
+        let regexp = args.get_or_undefined(0);
         if !regexp.is_null_or_undefined() {
             // a. Let matcher be ? GetMethod(regexp, @@match).
             // b. If matcher is not undefined, then
             if let Some(obj) = regexp.as_object() {
                 if let Some(matcher) = obj.get_method(context, WellKnownSymbols::match_())? {
                     // i. Return ? Call(matcher, regexp, « O »).
-                    return matcher.call(&regexp, &[o.clone()], context);
+                    return matcher.call(regexp, &[o.clone()], context);
                 }
             }
         }
@@ -1125,7 +1122,7 @@ impl String {
         let s = o.to_string(context)?;
 
         // 4. Let rx be ? RegExpCreate(regexp, undefined).
-        let rx = RegExp::create(regexp, JsValue::undefined(), context)?;
+        let rx = RegExp::create(regexp.clone(), JsValue::undefined(), context)?;
 
         // 5. Return ? Invoke(rx, @@match, « S »).
         let obj = rx.as_object().expect("RegExpCreate must return Object");
@@ -1370,21 +1367,17 @@ impl String {
         // Then we convert it into a Rust String by wrapping it in from_value
         let primitive_val = this.to_string(context)?;
         // If no args are specified, start is 'undefined', defaults to 0
-        let start = if args.is_empty() {
-            0
+        let start = if let Some(integer) = args.get(0) {
+            integer.to_integer(context)? as i32
         } else {
-            args.get(0)
-                .expect("failed to get argument for String method")
-                .to_integer(context)? as i32
+            0
         };
         let length = primitive_val.encode_utf16().count() as i32;
         // If less than 2 args specified, end is the length of the this object converted to a String
-        let end = if args.len() < 2 {
-            length
+        let end = if let Some(integer) = args.get(1) {
+            integer.to_integer(context)? as i32
         } else {
-            args.get(1)
-                .expect("Could not get argument")
-                .to_integer(context)? as i32
+            length
         };
         // Both start and end args replaced by 0 if they were negative
         // or by the length of the String if they were greater
@@ -1425,24 +1418,20 @@ impl String {
         // Then we convert it into a Rust String by wrapping it in from_value
         let primitive_val = this.to_string(context)?;
         // If no args are specified, start is 'undefined', defaults to 0
-        let mut start = if args.is_empty() {
-            0
+        let mut start = if let Some(integer) = args.get(0) {
+            integer.to_integer(context)? as i32
         } else {
-            args.get(0)
-                .expect("failed to get argument for String method")
-                .to_integer(context)? as i32
+            0
         };
         let length = primitive_val.chars().count() as i32;
         // If less than 2 args specified, end is +infinity, the maximum number value.
         // Using i32::max_value() should be safe because the final length used is at most
         // the number of code units from start to the end of the string,
         // which should always be smaller or equals to both +infinity and i32::max_value
-        let end = if args.len() < 2 {
-            i32::MAX
+        let end = if let Some(integer) = args.get(1) {
+            integer.to_integer(context)? as i32
         } else {
-            args.get(1)
-                .expect("Could not get argument")
-                .to_integer(context)? as i32
+            i32::MAX
         };
         // If start is negative it become the number of code units from the end of the string
         if start < 0 {
@@ -1485,8 +1474,8 @@ impl String {
         // 1. Let O be ? RequireObjectCoercible(this value).
         let this = this.require_object_coercible(context)?;
 
-        let separator = args.get(0).cloned().unwrap_or_default();
-        let limit = args.get(1).cloned().unwrap_or_default();
+        let separator = args.get_or_undefined(0);
+        let limit = args.get_or_undefined(1);
 
         // 2. If separator is neither undefined nor null, then
         if !separator.is_null_or_undefined() {
@@ -1498,7 +1487,7 @@ impl String {
                 .get_method(context, WellKnownSymbols::split())?
             {
                 // i. Return ? Call(splitter, separator, « O, limit »).
-                return splitter.call(&separator, &[this.clone(), limit], context);
+                return splitter.call(separator, &[this.clone(), limit.clone()], context);
             }
         }
 
@@ -1661,7 +1650,7 @@ impl String {
         let o = this.require_object_coercible(context)?;
 
         // 2. If regexp is neither undefined nor null, then
-        let regexp = args.get(0).cloned().unwrap_or_default();
+        let regexp = args.get_or_undefined(0);
         if !regexp.is_null_or_undefined() {
             // a. Let isRegExp be ? IsRegExp(regexp).
             // b. If isRegExp is true, then
@@ -1685,7 +1674,7 @@ impl String {
             if let Some(obj) = regexp.as_object() {
                 if let Some(matcher) = obj.get_method(context, WellKnownSymbols::match_all())? {
                     // i. Return ? Call(matcher, regexp, « O »).
-                    return matcher.call(&regexp, &[o.clone()], context);
+                    return matcher.call(regexp, &[o.clone()], context);
                 }
             }
         }
@@ -1694,7 +1683,7 @@ impl String {
         let s = o.to_string(context)?;
 
         // 4. Let rx be ? RegExpCreate(regexp, "g").
-        let rx = RegExp::create(regexp, JsValue::new("g"), context)?;
+        let rx = RegExp::create(regexp.clone(), JsValue::new("g"), context)?;
 
         // 5. Return ? Invoke(rx, @@matchAll, « S »).
         let obj = rx.as_object().expect("RegExpCreate must return Object");
@@ -1722,7 +1711,7 @@ impl String {
     ) -> JsResult<JsValue> {
         let this = this.require_object_coercible(context)?;
         let s = this.to_string(context)?;
-        let form = args.get(0).cloned().unwrap_or_default();
+        let form = args.get_or_undefined(0);
 
         let f_str;
 
@@ -1762,14 +1751,14 @@ impl String {
         let o = this.require_object_coercible(context)?;
 
         // 2. If regexp is neither undefined nor null, then
-        let regexp = args.get(0).cloned().unwrap_or_default();
+        let regexp = args.get_or_undefined(0);
         if !regexp.is_null_or_undefined() {
             // a. Let searcher be ? GetMethod(regexp, @@search).
             // b. If searcher is not undefined, then
             if let Some(obj) = regexp.as_object() {
                 if let Some(searcher) = obj.get_method(context, WellKnownSymbols::search())? {
                     // i. Return ? Call(searcher, regexp, « O »).
-                    return searcher.call(&regexp, &[o.clone()], context);
+                    return searcher.call(regexp, &[o.clone()], context);
                 }
             }
         }
@@ -1778,7 +1767,7 @@ impl String {
         let string = o.to_string(context)?;
 
         // 4. Let rx be ? RegExpCreate(regexp, undefined).
-        let rx = RegExp::create(regexp, JsValue::undefined(), context)?;
+        let rx = RegExp::create(regexp.clone(), JsValue::undefined(), context)?;
 
         // 5. Return ? Invoke(rx, @@search, « string »).
         let obj = rx.as_object().expect("RegExpCreate must return Object");
diff --git a/boa/src/builtins/symbol/mod.rs b/boa/src/builtins/symbol/mod.rs
index 78c11defbf5..e7a91cd8989 100644
--- a/boa/src/builtins/symbol/mod.rs
+++ b/boa/src/builtins/symbol/mod.rs
@@ -31,6 +31,8 @@ use std::cell::RefCell;
 
 use rustc_hash::FxHashMap;
 
+use super::JsArgs;
+
 thread_local! {
     static GLOBAL_SYMBOL_REGISTRY: RefCell<GlobalSymbolRegistry> = RefCell::new(GlobalSymbolRegistry::new());
 }
@@ -276,7 +278,7 @@ impl Symbol {
         args: &[JsValue],
         context: &mut Context,
     ) -> JsResult<JsValue> {
-        let sym = args.get(0).cloned().unwrap_or_default();
+        let sym = args.get_or_undefined(0);
         // 1. If Type(sym) is not Symbol, throw a TypeError exception.
         if let Some(sym) = sym.as_symbol() {
             // 2. For each element e of the GlobalSymbolRegistry List (see 20.4.2.2), do
diff --git a/boa/src/class.rs b/boa/src/class.rs
index 79938910016..4c4bf2041f6 100644
--- a/boa/src/class.rs
+++ b/boa/src/class.rs
@@ -7,6 +7,7 @@
 //!#    class::{Class, ClassBuilder},
 //!#    gc::{Finalize, Trace},
 //!#    Context, JsResult, JsValue,
+//!#    builtins::JsArgs,
 //!# };
 //!#
 //! // This does not have to be an enum it can also be a struct.
@@ -27,7 +28,7 @@
 //!     // This is what is called when we do `new Animal()`
 //!     fn constructor(_this: &JsValue, args: &[JsValue], context: &mut Context) -> JsResult<Self> {
 //!         // This is equivalent to `String(arg)`.
-//!         let kind = args.get(0).cloned().unwrap_or_default().to_string(context)?;
+//!         let kind = args.get_or_undefined(0).to_string(context)?;
 //!
 //!         let animal = match kind.as_str() {
 //!             "cat" => Self::Cat,