doc test for find_index

core/engine/src/object/builtins/jstypedarray.rs

@@ -358,7 +358,42 @@ impl JsTypedArray {
         )
     }
 
-    /// Calls `TypedArray.prototype.findIndex()`.
+    /// The `find_index` method of Array instances returns the index of the first
+    /// element in an array that satisfies the provided testing function.
+    /// If no elements satisfy the testing function, None is returned.
+    ///
+    /// It calls `TypedArray.prototype.findIndex()`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use boa_engine::{JsResult, object::{builtins::JsUint8Array, FunctionObjectBuilder}, NativeFunction, JsValue, Context};
+    /// # fn main() -> JsResult<()> {
+    /// let context = &mut Context::default();
+    /// let data: Vec<u8> = (0..=255).collect();
+    /// let array = JsUint8Array::from_iter(data, context)?;
+    ///
+    /// let greter_than_10_predicate = FunctionObjectBuilder::new(
+    ///     context.realm(),
+    ///     NativeFunction::from_fn_ptr(|_this, args, _context| {
+    ///         let element = args
+    ///             .first()
+    ///             .cloned()
+    ///             .unwrap_or_default()
+    ///             .as_number()
+    ///             .expect("error at number conversion");
+    ///         Ok(JsValue::Boolean(element > 10.0))
+    ///     }),
+    /// )
+    /// .build();
+    /// assert_eq!(
+    ///     array.find_index(greter_than_10_predicate, None, context),
+    ///     Ok(Some(11))
+    /// );
+    ///
+    /// # Ok(())
+    /// # }
+    /// ```
     #[inline]
     pub fn find_index(
         &self,