Benchmark: Array loop vs foreach vs map with return

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
var newA = [] arr.forEach(function (item){ newA.push(someFn(item)); }) return newA;
var newA = []
arr.forEach(function (item){
newA.push(someFn(item));
})
return newA;

for

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

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

map

var newA = arr.map(item => someFn(item))
return newA;

 
var newA = arr.map(item => someFn(item))return newA;

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: 4 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36

Browser/OS: Chrome 89 on Mac OS X 10.13.6

View result in a separate tab

Test name	Executions per second
foreach	8909.1 Ops/sec
for	5362.2 Ops/sec
map	10871.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 7 months ago):

Let's break down the provided JSON benchmark and its components.

Benchmark Definition

The provided JSON defines a JavaScript microbenchmark that tests three different approaches to iterate over an array:

Array Loop: This approach uses a traditional for loop to iterate over the array, performing some calculations on each element.
Foreach: This approach uses the forEach method to iterate over the array, calling a callback function for each element.
Map: This approach uses the map method to create a new array with the results of applying a transformation function to each element.

Options Compared

The benchmark compares these three approaches:

Array Loop (for): The traditional for loop approach, which is generally considered a simple and efficient way to iterate over arrays.
Foreach: The forEach method approach, which is a more modern and concise way to iterate over arrays, but may be slower due to the overhead of the callback function.
Map: The map method approach, which creates a new array with transformed elements, but can be more efficient than foreach if the transformation function is expensive.

Pros and Cons

Here are some pros and cons for each approach:

Array Loop (for):
- Pros: Simple, efficient, and easy to understand.
- Cons: Can be verbose and cumbersome with large arrays.
Foreach:
- Pros: More concise and expressive than for, but may introduce overhead due to callback functions.
- Cons: May be slower due to the additional function call.
Map:
- Pros: Efficient if the transformation function is expensive, creates a new array with transformed elements.
- Cons: May not be suitable for large datasets due to memory constraints.

Library and Syntax

The benchmark uses the following JavaScript library:

None explicitly mentioned. However, it's likely that the forEach and map methods are part of the standard ECMAScript API or a library like Lodash.

There are no special JavaScript features or syntaxes used in this benchmark.

Other Alternatives

If you're looking for alternative approaches to iterate over arrays, consider:

Reduce: A method that applies a reduction function to all elements of an array.
filter(): A method that creates a new array with only the elements that pass the test implemented by a provided function.
forEach (as used in the benchmark): A method that calls a callback function for each element in an array.

Note that these alternatives may have different performance characteristics and use cases compared to for, foreach, and map.

LLMs can make mistakes. Check important info.

Let's break down the provided JSON benchmark and its components.

**Benchmark Definition**

The provided JSON defines a JavaScript microbenchmark that tests three different approaches to iterate over an array:

1. **Array Loop**: This approach uses a traditional `for` loop to iterate over the array, performing some calculations on each element.
2. **Foreach**: This approach uses the `forEach` method to iterate over the array, calling a callback function for each element.
3. **Map**: This approach uses the `map` method to create a new array with the results of applying a transformation function to each element.

**Options Compared**

The benchmark compares these three approaches:

* **Array Loop (for)**: The traditional `for` loop approach, which is generally considered a simple and efficient way to iterate over arrays.
* **Foreach**: The `forEach` method approach, which is a more modern and concise way to iterate over arrays, but may be slower due to the overhead of the callback function.
* **Map**: The `map` method approach, which creates a new array with transformed elements, but can be more efficient than `foreach` if the transformation function is expensive.

**Pros and Cons**

Here are some pros and cons for each approach:

* **Array Loop (for)**:
	+ Pros: Simple, efficient, and easy to understand.
	+ Cons: Can be verbose and cumbersome with large arrays.
* **Foreach**:
	+ Pros: More concise and expressive than `for`, but may introduce overhead due to callback functions.
	+ Cons: May be slower due to the additional function call.
* **Map**:
	+ Pros: Efficient if the transformation function is expensive, creates a new array with transformed elements.
	+ Cons: May not be suitable for large datasets due to memory constraints.

**Library and Syntax**

The benchmark uses the following JavaScript library:

* None explicitly mentioned. However, it's likely that the `forEach` and `map` methods are part of the standard ECMAScript API or a library like Lodash.

There are no special JavaScript features or syntaxes used in this benchmark.

**Other Alternatives**

If you're looking for alternative approaches to iterate over arrays, consider:

* **Reduce**: A method that applies a reduction function to all elements of an array.
* **filter()**: A method that creates a new array with only the elements that pass the test implemented by a provided function.
* **forEach** (as used in the benchmark): A method that calls a callback function for each element in an array.

Note that these alternatives may have different performance characteristics and use cases compared to `for`, `foreach`, and `map`.

Related benchmarks:

Array loop vs foreach vs map with return (version: 0)

Comparing performance of: foreach vs for vs map

Created: 4 years 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 7 months ago):