Benchmark: for vs foreach vs some vs every vs for..of vs map / 2

Script Preparation code:

var array = Array.from(Array(1000).keys());

Tests:

for
for (var i = 0; i < array.length; i++) { console.log(array[i]); }
foreach
array.forEach(function(i) { console.log(array[i]); });
some
array.some(function(i) { console.log(array[i]); });
every
array.every(function(i) { console.log(array[i]); });
for..of
for (var i of array) { console.log(array[i]); }
map
array.map(a => console.log(a));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
foreach
some
every
for..of
map

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36

Browser/OS: Chrome 111 on Linux

View result in a separate tab

Test name	Executions per second
for	142.7 Ops/sec
foreach	156.8 Ops/sec
some	158.6 Ops/sec
every	106403.3 Ops/sec
for..of	130.1 Ops/sec
map	169.1 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks, comparing different approaches to achieve similar results.

The provided benchmark definition json represents a series of tests designed to compare the performance of six different loop constructs:

1. `for` loop
2. `forEach` loop
3. `some` loop
4. `every` loop
5. `for..of` loop
6. `map` function

The test cases use a predefined array of 1000 elements, and the goal is to print each element's value to the console.

**Loop Constructs Comparison**

Let's break down each loop construct:

1. **`for` loop**: This traditional loop uses an index variable (`i`) and increments it manually.
	* Pros: Simple and well-established.
	* Cons: Can be error-prone if not implemented correctly.
2. **`forEach` loop**: This loop iterates over an array using a callback function that receives each element as an argument.
	* Pros: More concise and expressive than traditional `for` loops.
	* Cons: May have higher overhead due to the need to pass additional arguments to the callback function.
3. **`some` loop**: This loop returns `true` if at least one element in the array passes a test (provided as a callback function).
	* Pros: Can be useful for early exits or when only one condition needs to be checked.
	* Cons: May not be suitable for iterating over all elements in the array.
4. **`every` loop**: This loop returns `true` if all elements in the array pass a test (provided as a callback function).
	* Pros: Useful for ensuring that all conditions are met before proceeding.
	* Cons: May return false if any element fails, which can be unexpected behavior.
5. **`for..of` loop**: This modern loop iterates over an array using a `for...of` statement, which is more concise and expressive than traditional loops.
	* Pros: More readable and efficient than traditional loops.
	* Cons: May not be supported in older browsers or environments.
6. **`map` function**: This function applies a transformation to each element in the array and returns a new array with the transformed elements.
	* Pros: Can be used for both iteration and transformation of array data.
	* Cons: Creates a new array, which may not be desirable for large datasets.

**Library Usage**

The `Array.from()` method is used to create an array from another iterable (in this case, `Array(1000).keys()`), which provides a way to generate an array of numbers without using traditional loops.

No other libraries are explicitly mentioned in the provided benchmark definition.

**Special JS Features**

* **Arrow functions**: Used extensively throughout the benchmark definitions. Arrow functions provide a concise syntax for defining small, single-expression functions.
* **Template literals**: Not used directly, but the `console.log` statements use template literals internally (e.g., `array[i]`).
* **Spread operators**: Used in the initial array creation (`Array.from(Array(1000).keys())`) to expand the inner array into separate elements.

**Alternatives**

If you're looking for alternatives to MeasureThat.net, consider:

1. **Benchmarking frameworks**: Tools like Benchmark.js or Fastbench provide more comprehensive benchmarking capabilities.
2. **JavaScript testing libraries**: Libraries like Jest or Mocha offer robust testing and benchmarking features.
3. **Browser-specific benchmarking tools**: Some browsers, like Chrome's DevTools, include built-in benchmarking capabilities.

In conclusion, MeasureThat.net provides a simple yet effective way to compare the performance of different loop constructs in JavaScript. By understanding the pros and cons of each approach, you can choose the most suitable method for your specific use case.

Related benchmarks:

for vs foreach vs some vs every vs for..of vs map / 2 (version: 0)

Compare loop performance

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

Created: one year ago by: Guest

Jump to the latest result

for

foreach

some

every

for..of

map

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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