Benchmark: Array loop vs foreach vs map forsk

Script Preparation code:

   var arr = [];
    for (var i = 0; i < 1000; i++) {
      arr[i] = i;
    }
  
    function someFn(i) {
      return i * 3 * 8;
    }

AخA
 
   var arr = [];    for (var i = 0; i < 1000; i++) {      arr[i] = i;    }      function someFn(i) {      return i * 3 * 8;    }

Tests:

foreach
const arrayResult = [] arr.forEach(function (item){ arrayResult.push(someFn(item)); })
const arrayResult = []
arr.forEach(function (item){
arrayResult.push(someFn(item));
})

for

const arrayResult = []
for (var i = 0, len = arr.length; i < len; i++) {
  arrayResult.push(someFn(arr[i]));
}

 
const arrayResult = []for (var i = 0, len = arr.length; i < len; i++) {  arrayResult.push(someFn(arr[i]));}

map

const arrayResult = arr.map(item => someFn(item))

 
const arrayResult = arr.map(item => someFn(item))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

Test case name	Result
foreach
for
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/117.0.0.0 Safari/537.36

Browser/OS: Chrome 117 on Linux

View result in a separate tab

Test name	Executions per second
foreach	1610.0 Ops/sec
for	1133.1 Ops/sec
map	2147.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

Let's break down the provided benchmark definition and test cases.

Benchmark Definition

The provided JSON represents a JavaScript microbenchmark, which measures the performance of different approaches to perform an operation on an array. The benchmark is defined by two scripts:

Script Preparation Code: This code creates an empty array arr with 1000 elements and populates it with numbers from 0 to 999 using a for loop. Additionally, a function someFn(i) is defined that takes an integer i as input and returns the result of i * 3 * 8.
Html Preparation Code: This code is empty, which means no HTML content needs to be generated for this benchmark.

Test Cases

The benchmark has three test cases:

foreach
- The script definition uses forEach to iterate over the array and apply the someFn function to each element.
for
- The script definition uses a traditional for loop to iterate over the array and apply the someFn function to each element.
map
- The script definition uses the Array.prototype.map() method to create a new array with the result of applying the someFn function to each element in the original array.

Options Compared

The benchmark is comparing three different approaches:

forEach: Uses the forEach method to iterate over the array.
for: Uses a traditional for loop to iterate over the array.
map: Uses the Array.prototype.map() method to create a new array with the transformed elements.

Pros and Cons of Each Approach

forEach:
- Pros: Easy to read, concise syntax, can be used for both iteration and callback functions.
- Cons: May not be as optimized as traditional loops, can lead to slower performance due to function call overhead.
for:
- Pros: More control over loop iterations, can be faster than forEach due to reduced function call overhead.
- Cons: More verbose syntax, requires manual index management.
map:
- Pros: Concise syntax, can create new arrays more efficiently than traditional loops.
- Cons: May lead to slower performance due to additional array creation and copying, can be less intuitive for developers unfamiliar with the method.

Libraries Used

None of the provided benchmark definitions use external libraries. The Array.prototype.map() method is a built-in JavaScript method.

Special JS Features or Syntax

The benchmark uses standard JavaScript features:

Arrow functions (=>)
Function expressions
Looping constructs ( for, forEach )
Array methods (map())

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark, which measures the performance of different approaches to perform an operation on an array. The benchmark is defined by two scripts:

1. **Script Preparation Code**: This code creates an empty array `arr` with 1000 elements and populates it with numbers from 0 to 999 using a `for` loop. Additionally, a function `someFn(i)` is defined that takes an integer `i` as input and returns the result of `i * 3 * 8`.
2. **Html Preparation Code**: This code is empty, which means no HTML content needs to be generated for this benchmark.

**Test Cases**

The benchmark has three test cases:

1. **foreach**
	* The script definition uses `forEach` to iterate over the array and apply the `someFn` function to each element.
2. **for**
	* The script definition uses a traditional `for` loop to iterate over the array and apply the `someFn` function to each element.
3. **map**
	* The script definition uses the `Array.prototype.map()` method to create a new array with the result of applying the `someFn` function to each element in the original array.

**Options Compared**

The benchmark is comparing three different approaches:

1. **forEach**: Uses the `forEach` method to iterate over the array.
2. **for**: Uses a traditional `for` loop to iterate over the array.
3. **map**: Uses the `Array.prototype.map()` method to create a new array with the transformed elements.

**Pros and Cons of Each Approach**

1. **forEach**:
	* Pros: Easy to read, concise syntax, can be used for both iteration and callback functions.
	* Cons: May not be as optimized as traditional loops, can lead to slower performance due to function call overhead.
2. **for**:
	* Pros: More control over loop iterations, can be faster than `forEach` due to reduced function call overhead.
	* Cons: More verbose syntax, requires manual index management.
3. **map**:
	* Pros: Concise syntax, can create new arrays more efficiently than traditional loops.
	* Cons: May lead to slower performance due to additional array creation and copying, can be less intuitive for developers unfamiliar with the method.

**Libraries Used**

None of the provided benchmark definitions use external libraries. The `Array.prototype.map()` method is a built-in JavaScript method.

**Special JS Features or Syntax**

The benchmark uses standard JavaScript features:

* Arrow functions (`=>`)
* Function expressions
* Looping constructs ( `for`, `forEach` )
* Array methods (`map()`)

Related benchmarks:

Array loop vs foreach vs map forsk (version: 0)

Comparing performance of: foreach vs for vs map

Created: one year ago by: Guest

Jump to the latest result

foreach

for

map

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):