Benchmark: For Each Vs Map Example Medium1

Script Preparation code:

// Create sample data
var array = [];
array.forEach( i => array.push(i) );

var manipulateFn = num => {
	return num * 2 * 3;
}

Tests:

.map
var newArray = array.map( i => {console.log(manipulateFn(i))});
.forEach
var newArray = []; array.forEach( i => { // newArray.push(manipulateFn(i)); console.log(manipulateFn(i)); });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
.map
.forEach

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

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Let's break down the provided benchmark and explain what's being tested.

The benchmark tests two JavaScript methods: `forEach` and `map`. The test is comparing the performance of these two methods when used to manipulate an array of numbers.

**Options compared:**

1. **`forEach`**: This method iterates over the elements of an array, allowing you to execute a callback function for each element.
2. **`map`**: This method creates a new array with the results of applying a provided function to every element in the original array.

**Pros and Cons:**

* `forEach`:
	+ Pros: It's generally faster because it doesn't create a new array, only pushing elements to the existing one.
	+ Cons: It can be slower for very large arrays because it has to iterate over each element individually, which can lead to memory issues if not handled correctly.
* `map`:
	+ Pros: It creates a new array with the results, making it easier to manage and reuse the transformed data. This approach is also more suitable when you need to perform multiple operations on the array's elements simultaneously.
	+ Cons: It creates a new array, which can be memory-intensive for large datasets.

**Library used:**

In this benchmark, there is no explicit library mentioned, but `forEach` and `map` are built-in JavaScript methods. However, some browsers might have variations of these methods or additional features (e.g., ES6+ browsers support more modern `forEach` implementations).

**Special JS feature/syntax:**

None mentioned in the provided code snippets.

**Other alternatives:**

For comparing performance between `forEach` and `map`, other approaches could include:

1. Using `reduce()`: This method accumulates a value by iterating over an array, similar to `forEach`. However, it's more concise and can be faster for large arrays.
2. Using `for...of` loops: These are more modern and efficient alternatives to `forEach`.
3. Implementing a custom loop using basic JavaScript constructs (e.g., `while` loops).
4. Using third-party libraries or frameworks that optimize array operations, like Lodash or Ramda.

Keep in mind that the choice of approach depends on the specific use case, performance requirements, and personal preference.

Related benchmarks:

For Each Vs Map Example Medium1 (version: 0)

Comparing performance of: .map vs .forEach

Created: 7 years ago by: Guest

Jump to the latest result

.map

.forEach

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):