Benchmark: forEach vs Spread 2021

Tests:

forEach
let newArr = []; const data = [1, 2, 3, 4, 5]; data.forEach((item) => newArr.push(item));
Spread
let newArr = []; const data = [1, 2, 3, 4, 5]; newArr = [...newArr, ...data];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
forEach
Spread

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition and Purpose**

The provided JSON represents a benchmark definition, which specifies two test cases: `forEach` and `Spread`. The goal of this benchmark is to compare the performance of these two approaches for iterating over an array and pushing items into a new array.

**Options Compared**

The benchmark compares two options:

1. **`forEach`**: This approach uses the `Array.prototype.forEach()` method, which executes a callback function once for each element in the array.
2. **`Spread`**: This approach uses the spread operator (`...`) to create a new array by spreading the elements of the original array into a new array.

**Pros and Cons**

* **`forEach`**:
	+ Pros: More concise and readable code, as it eliminates the need to manually increment an index.
	+ Cons: May have performance overhead due to the callback function execution, which can lead to slower results compared to direct indexing.
* **`Spread`**:
	+ Pros: Directly pushes elements into a new array without any intermediate iterations, potentially leading to faster results.
	+ Cons: Requires more verbose code and may lead to errors if not used correctly.

**Library Used**

None. This benchmark uses native JavaScript features only.

**Special JS Feature or Syntax**

The `forEach` method is a built-in JavaScript feature that was introduced in ECMAScript 5 (ES5). The spread operator (`...`) was also introduced in ES6.

**Benchmark Preparation Code**

The provided script preparation code is empty, which means the benchmark uses the default settings for MeasureThat.net.

**Other Alternatives**

For iterating over an array and pushing items into a new array, other alternatives to `forEach` and `Spread` include:

* **`for...of` loop**: A more traditional loop approach that avoids callback functions.
* **`Array.prototype.map()`**: A method that returns a new array with the results of applying a provided function to each element in the original array.
* **Direct indexing**: Manually incrementing an index to access and push elements into a new array.

These alternatives may offer different trade-offs in terms of code readability, performance, and error handling. The choice of approach depends on the specific use case and personal preference.

Related benchmarks:

forEach vs Spread 2021 (version: 0)

Comparing performance of: forEach vs Spread

Created: 5 years ago by: Guest

Jump to the latest result

forEach

Spread

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):