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querySelector vs querySelectorAll test
(version: 0)
Benchmark.js
Comparing performance of:
querySelectorAll vs querySelector
Created:
2 years ago
by:
Registered User
Go to the latest result
HTML Preparation code:
<content id="demo">Hello World!</content>
Script Preparation code:
let components = ''; for (let i=0; i<10000; i+=1) { components += '<div class="component" data-component="component' + i + '">Content ' + i + '</div>' } document.getElementById("demo").innerHTML = components;
Tests:
querySelectorAll
let components = document.querySelectorAll('[data-component]');
querySelector
let components = document.querySelector('[data-component]');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
querySelectorAll
querySelector
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Browser/OS:
Chrome 120 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=499822" width="100%" height="500px"></iframe>
querySelector
6.0M/s
querySelectorAll
8K/s
View exact numbers
Test name
Executions per second
✓
querySelector
5,971,924 Ops/sec
querySelectorAll
7,848 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and its options. **Benchmark Overview** The benchmark is designed to compare the performance of two JavaScript methods: `querySelector` and `querySelectorAll`. The test creates a large HTML string with 10,000 `<div>` elements, each containing unique data attributes. The goal is to find all or one specific element within this string using these two methods. **Options Compared** The benchmark compares the following options: 1. **`querySelector```**: This method returns the first matching element, specified by its CSS selector. 2. **`querySelectorAll```**: This method returns a NodeList containing all elements that match the specified CSS selector. **Pros and Cons of Each Approach** * **`querySelector```** * Pros: * Less memory-intensive since it only retrieves one element at a time * May be faster in cases where a single matching element is expected * Cons: * Returns `null` if no matching element is found, requiring additional checks * Can lead to slower performance when dealing with large datasets * **`querySelectorAll```** * Pros: * Efficiently retrieves all matching elements in a single operation * Reduces memory usage since only one request is made for multiple results * Cons: * Returns an empty NodeList if no elements match the selector * May be slower due to increased computation and potential additional DOM queries **Library Usage** There are no libraries mentioned in the benchmark definition or test cases. **Special JavaScript Features/Syntax** There is one special feature used: `[data-component]`. This is a CSS selector syntax that uses attribute selectors. It's a modern way of selecting elements based on their attributes, rather than traditional class or ID selectors. The browser being tested (Chrome 120) likely supports this syntax. **Other Alternatives** If `querySelector` and `querySelectorAll` are not suitable for the benchmark, alternative approaches might include: * Using a library like Lodash, which provides a `querySelectorAll` function that returns a more efficient result set * Implementing your own custom selector engine using JavaScript * Utilizing web worker threads or other parallel computing techniques to speed up computations
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