Benchmark: Array loop vs foreach vs map saved

Script Preparation code:

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

Tests:

foreach
const newArr = []; arr.forEach(function (item){ newArr.push(someFn(item)); })
for
const newArr = []; for (var i = 0, len = arr.length; i < len; i++) { newArr.push(someFn(arr[i])); }
map
const newArr = arr.map(item => someFn(item))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
foreach
for
map

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 break down the provided benchmark and its results.

**Benchmark Definition**

The test is designed to compare the performance of three approaches:

1. `foreach` loop
2. Traditional `for` loop
3. `map()` method (a built-in JavaScript function)

In the script preparation code, an array `arr` is created with 1000 elements and a function `someFn(i)` is defined to perform some calculation on each element.

**Options Compared**

The three options are compared in terms of performance, which is measured as the number of executions per second. This benchmark measures how fast each option can execute the code without modifying the original array.

**Pros and Cons of Each Approach:**

1. **foreach Loop**
	* Pros:
		+ Easy to read and understand
		+ Does not modify the original array
	* Cons:
		+ May have higher overhead due to function call and iteration
2. **Traditional `for` Loop**
	* Pros:
		+ Fast and efficient for simple loops
		+ Can be optimized for better performance
	* Cons:
		+ Requires manual index management
		+ May have higher overhead due to variable declaration and iteration
3. **map() Method**
	* Pros:
		+ Fast and efficient for mapping functions
		+ Does not modify the original array (returns a new one)
	* Cons:
		+ May have higher overhead due to function call and array creation

**Library Usage**

None of the provided benchmark scripts use any external libraries.

**Special JS Features or Syntax**

The `map()` method is used, which is a built-in JavaScript feature. The traditional `for` loop uses a common syntax in many programming languages.

**Other Considerations:**

* The benchmark measures the performance of each option without modifying the original array.
* The results are likely to be affected by factors such as the browser's engine, device platform, and operating system.

**Alternatives:**

If you want to explore alternative approaches or optimize this benchmark, consider the following options:

1. **Iterators**: Instead of using a `foreach` loop, you can use iterators (e.g., `for...of`) which might provide better performance.
2. **Array.prototype.reduce()`: Another approach is to use `reduce()` instead of `map()`, which might be more efficient for this specific use case.
3. **Native WebAssembly**: If you're looking for a significant performance boost, consider using native WebAssembly (WASM) and compiling the code to machine code.

Please note that these alternatives may not necessarily improve performance in all cases and should be thoroughly tested for your specific use case.

Related benchmarks:

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

Comparing performance of: foreach vs for vs map

Created: 3 years ago by: Guest

Jump to the latest result

foreach

for

map

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):