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foreach and map
(version: 0)
Comparing performance of:
foreach vs map
Created:
7 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var aaa = [1,2,3,4,5,6,7,8,9]
Tests:
foreach
aaa.forEach(num => num * 2)
map
aaa.map(num => num * 2)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
foreach
map
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and its test cases. **Benchmark Overview** MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON represents a single benchmark definition, which consists of two test cases: "foreach" and "map". Both test cases are designed to measure the performance of iterating over an array using these methods. **Script Preparation Code** The script preparation code is `var aaa = [1,2,3,4,5,6,7,8,9];`. This code defines a simple JavaScript array called `aaa` with 9 elements. The purpose of this array is to serve as a test subject for the iteration methods being benchmarked. **Html Preparation Code** The html preparation code is null, which means that no HTML-related setup is required for these tests. **Individual Test Cases** There are two test cases: 1. **"foreach"`** * Benchmark Definition: `aaa.forEach(num => num * 2)` * This test case measures the performance of using the `forEach` method to iterate over the array and perform a simple operation (in this case, multiplying each element by 2). * The `forEach` method is called with an arrow function that takes the current element (`num`) as an argument. * The purpose of this test is to measure how efficiently JavaScript can execute a loop-based iteration using the `forEach` method. 2. **"map"`** * Benchmark Definition: `aaa.map(num => num * 2)` * This test case measures the performance of using the `map` method to create a new array with the result of applying an operation to each element in the original array (in this case, multiplying each element by 2). * The `map` method is called with an arrow function that takes the current element (`num`) as an argument. * The purpose of this test is to measure how efficiently JavaScript can execute a transform-based iteration using the `map` method. **Library Used: None** There are no external libraries used in these test cases. Both tests rely on built-in JavaScript methods and operators. **Special JS Features/Syntax: None** Neither of the benchmark test cases uses any special JavaScript features or syntax that would require additional explanation. **Alternative Approaches** Other ways to iterate over an array include: * `for` loop: `for (var i = 0; i < aaa.length; i++) { num = aaa[i]; num *= 2 }` * `while` loop: `var i = 0; while (i < aaa.length) { var num = aaa[i]; num *= 2; i++; }` * Destructuring assignment: `const [num] = aaa; num *= 2;` * Spreads operator: `[...aaa].forEach(num => num * 2)` * Array methods like `reduce`, `filter`, or `every` can also be used to iterate over arrays, but these are more complex and typically not suitable for simple benchmarking. Keep in mind that the performance differences between these approaches may vary depending on the specific JavaScript engine, platform, and other factors.
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