Benchmark: for vs foreach vs some vs for..ofrrrrrr55

Script Preparation code:

var array = new Array(100);

Tests:

for
for (var i = 0; i < array.length; i++) { array[i] = 1; }
foreach
array.forEach(function(i) { array[i] = 1; });
some
array.some(function(i) { array[i] = 1; });
for..of
for (var i of array) { array[i] = 1; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
foreach
some
for..of

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 benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is designed to compare the performance of different loop iteration methods in JavaScript: `for`, `forEach`, `some`, and `for...of`. The benchmark creates an array with 100 elements and measures how many iterations each loop method performs per second.

**Loop Iteration Methods**

Here's a brief explanation of each loop iteration method:

* `for`: This is the traditional loop syntax, where you declare a variable (in this case, `i`) and increment it manually to iterate over the array.
* `forEach`: This method executes a callback function for each element in an array. In this benchmark, the callback function simply assigns the value 1 to each element.
* `some`: Similar to `forEach`, but returns `true` as soon as the condition inside the callback function is met (in this case, always `true` since we're assigning a value). The loop continues iterating over the array until `some` returns `false`.
* `for...of`: This is a newer loop syntax introduced in ECMAScript 2015. It allows you to iterate over arrays using a simple for-each syntax.

**Pros and Cons of Each Approach**

Here's a brief summary of the pros and cons of each approach:

* `for`:
	+ Pros: Simple, easy to understand, and widely supported.
	+ Cons: Can be slower due to manual index management.
* `forEach`:
	+ Pros: Convenient, expressive, and modern.
	+ Cons: May incur additional overhead due to callback function execution.
* `some`:
	+ Pros: Similar to `forEach`, but can be faster since it returns early.
	+ Cons: Can be less intuitive for those unfamiliar with the method.
* `for...of`:
	+ Pros: Modern, expressive, and efficient.
	+ Cons: May not be as widely supported in older browsers.

**Library Usage**

None of the loop iteration methods use any external libraries. The benchmark relies solely on built-in JavaScript features.

**Special JS Features or Syntax**

This benchmark uses modern JavaScript features:

* `var` is used for variable declaration (not `let` or `const`, which are more modern alternatives).
* `Array.prototype.forEach` and `Array.prototype.some` are used to execute the callback functions.
* The `for...of` loop syntax is used to iterate over the array.

**Other Alternatives**

If you're interested in exploring alternative loop iteration methods, here are a few options:

* `while`: A traditional loop syntax that requires manual index management.
* `Array.prototype.forEach` with a custom callback function (not using the `some` method).
* Using a library like Lodash or Ramda to implement an iterative algorithm.

Keep in mind that these alternatives may not be as efficient or modern as the methods used in this benchmark.

Related benchmarks:

for vs foreach vs some vs for..ofrrrrrr55 (version: 0)

Compare loop performance

Comparing performance of: for vs foreach vs some vs for..of

Created: 5 years ago by: Guest

Jump to the latest result

for

foreach

some

for..of

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):