Removed some clippy warnings in nightly

boa/src/builtins/function/mod.rs

@@ -346,7 +346,7 @@ impl BuiltInFunctionObject {
         })?;
 
         let this_arg = args.get_or_undefined(0).clone();
-        let bound_args = args.get(1..).unwrap_or_else(|| &[]).to_vec();
+        let bound_args = args.get(1..).unwrap_or(&[]).to_vec();
         let arg_count = bound_args.len() as i64;
 
         // 3. Let F be ? BoundFunctionCreate(Target, thisArg, args).

boa/src/builtins/map/ordered_map.rs

@@ -155,7 +155,7 @@ impl<V> OrderedMap<V> {
     ///
     /// Computes in **O(1)** time (average).
     pub fn get(&self, key: &JsValue) -> Option<&V> {
-        self.map.get(key).map(Option::as_ref).flatten()
+        self.map.get(key).and_then(Option::as_ref)
     }
 
     /// Get a key-value pair by index.

boa/src/builtins/number/mod.rs

@@ -1141,7 +1141,7 @@ impl Number {
 /// Helper function that formats a float as a ES6-style exponential number string.
 fn f64_to_exponential(n: f64) -> String {
     match n.abs() {
-        x if x >= 1.0 || x == 0.0 => format!("{:e}", n).replace("e", "e+"),
+        x if x >= 1.0 || x == 0.0 => format!("{:e}", n).replace('e', "e+"),
         _ => format!("{:e}", n),
     }
 }

boa/src/builtins/typed_array/mod.rs

@@ -2794,12 +2794,11 @@ impl TypedArray {
         // 6. Return name.
         Ok(this
             .as_object()
-            .map(|obj| {
+            .and_then(|obj| {
                 obj.borrow()
                     .as_typed_array()
                     .map(|o| o.typed_array_name().name().into())
             })
-            .flatten()
             .unwrap_or(JsValue::Undefined))
     }