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array from map vs foreach
(version: 0)
Comparing performance of:
Array.from + map vs foreach
Created:
4 years ago
by:
Guest
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HTML Preparation code:
<div class="name"><div class="name"><div class="name">
Tests:
Array.from + map
Array.from(document.querySelectorAll('.name')).map(element => { console.log(element); });
foreach
document.querySelectorAll('.name').forEach(element => { console.log(element); });
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Array.from + map
foreach
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 provided benchmark definition and test cases. **Benchmark Overview** The benchmark compares the performance of two approaches: using `forEach` loop to iterate over an array, versus using `Array.from()` method with a callback function to create an array from another array. The goal is to measure which approach is faster. **Library Used** In this benchmark, a JavaScript library called `document.querySelector()` and its alias `document.querySelectorAll()` are used to retrieve elements from the DOM. These methods are part of the W3C DOM API and provide a way to query an HTML document to find specific elements. The purpose of using these libraries is to create a test case that simulates real-world scenarios where JavaScript code needs to iterate over DOM elements. **Special JS Feature/Syntax** The benchmark uses the `arrow function` syntax, which was introduced in ECMAScript 2015 (ES6). Arrow functions are a concise way to define small functions. They are defined using the `=>` operator and have several benefits, such as avoiding the need to declare `this` context explicitly. **Test Cases** There are two test cases: 1. **"Array.from + map"`**: This test case creates an array from the DOM elements retrieved using `document.querySelectorAll('.name')`, and then maps over the array, logging each element to the console. 2. **"foreach"`**: This test case uses a traditional `forEach` loop to iterate over the same DOM elements retrieved using `document.querySelectorAll('.name')`, also logging each element to the console. **Options Compared** The benchmark compares two options: * Using `Array.from()` method with a callback function (Test Case 1: "Array.from + map") * Using a traditional `forEach` loop (Test Case 2: "foreach") **Pros and Cons of Each Approach** * **Using `Array.from()`**: Pros: + More concise syntax + Avoids the need to declare `this` context explicitly + Can be faster in some cases, as it avoids the overhead of a traditional loop Cons: + May not work correctly for older browsers or environments that don't support the `Array.prototype.from()` method * **Using `forEach`**: Pros: + Works on older browsers and environments + Easy to understand and implement Cons: + Less concise syntax + Can be slower due to the overhead of a traditional loop **Other Alternatives** There are other alternatives to using `Array.from()` and `forEach`, such as: * Using `slice()` method to create a new array (instead of `Array.from()`) * Using a traditional `for` loop or a `while` loop * Using libraries like Lodash or Ramda for functional programming approaches Keep in mind that the choice of approach depends on the specific use case, performance requirements, and compatibility with different browsers and environments.
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