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Benchmarking simple Loop Operations Javascript
(version: 0)
Comparing performance of:
for vs forEach vs map
Created:
5 years ago
by:
Registered User
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Script Preparation code:
var arr = []; for (let i = 0; i < 1000; i++) { arr[i] = i; }
Tests:
for
let updatedNumbers = []; for(let i=0; i<arr.length; i++){ updatedNumbers.push(arr[i] + 5); }
forEach
let updatedNumbers = []; arr.forEach((num) => updatedNumbers.push(num + 5));
map
let updatedNumbers = arr.map(num => num + 5 );
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
for
forEach
map
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll explain the JavaScript microbenchmark that's being tested on MeasureThat.net. **Benchmark Overview** The benchmark is designed to measure the performance of three different loop operations in JavaScript: `for`, `forEach`, and `map`. The test case uses an array `arr` with 1000 elements, which are initialized with values from 0 to 999 using a script preparation code. **Loop Operations Compared** 1. **For Loop**: A traditional `for` loop is used to iterate over the array, where the index `i` ranges from 0 to 999. 2. **forEach Loop**: An `Array.prototype.forEach()` method is used to iterate over the array, where each element's value is added to a new array `updatedNumbers`. 3. **Map Function**: The `Array.prototype.map()` function is used to create a new array by applying a transformation function (`num => num + 5`) to each element of the original array. **Pros and Cons** * **For Loop**: Pros: straightforward, easy to understand; Cons: can be slower due to index management and iteration overhead. * **forEach Loop**: Pros: concise, modern JavaScript syntax; Cons: may incur overhead due to function call and iterator creation. * **Map Function**: Pros: concise, vectorized (can take advantage of parallel processing), and efficient for large datasets; Cons: requires a transformation function, which can be less readable. **Library Usage** In this benchmark, none of the libraries are explicitly mentioned. However, it's worth noting that some modern browsers may use internal libraries to optimize their JavaScript engines. **Special JavaScript Features/Syntax** This benchmark does not use any special JavaScript features or syntax beyond what's standard in JavaScript (ECMAScript 2022).
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