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array.from vs array slice with querySelectorAll
(version: 0)
Comparing performance of:
Array.from vs Array slice
Created:
5 years ago
by:
Registered User
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HTML Preparation code:
<div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div>
Script Preparation code:
var testIterable = () => document.querySelectorAll('div');
Tests:
Array.from
const arr = Array.from(testIterable());
Array slice
const arrs = Array.prototype.slice.call(testIterable());
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
Array slice
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark definition, test cases, and result to understand what's being tested. **Benchmark Definition** The benchmark defines two tests: `Array.from` and `Array slice`. Both tests aim to measure the performance of creating an array from an iterable source. The source iterable is generated using the `testIterable()` function, which selects all `<div>` elements from the HTML document. **Options Being Compared** Two options are being compared: 1. **`Array.from()`**: This method creates a new array from an iterable source. 2. **`Array.prototype.slice.call(testIterable())`**: This approach uses the `slice()` method of the Array prototype to create a new array from the same iterable source. **Pros and Cons** * **`Array.from()`**: + Pros: More modern, concise, and efficient way to create an array from an iterable. + Cons: May not work with all older browsers or versions. * **`Array.prototype.slice.call(testIterable())`**: + Pros: Works across different browsers and versions, as it relies on the `slice()` method of the Array prototype. + Cons: Less concise and may require more overhead due to the additional call. **Library Used** The `testIterable()` function uses the `querySelectorAll()` method from the DOM API to select all `<div>` elements from the HTML document. This is a native JavaScript method, so no library is required. **Special JS Feature or Syntax** No special JavaScript feature or syntax is used in this benchmark. It only relies on standard JavaScript features and DOM API methods. **Other Considerations** When running this benchmark, it's essential to consider: * The performance of the browser and its version. * The size and complexity of the iterable source (in this case, a large number of `<div>` elements). * Any potential browser or engine-specific optimizations that might affect the results. **Alternatives** If you want to explore other alternatives for creating arrays from iterables, consider: * Using `Array.prototype.map()` in combination with `Array.prototype.filter()` and `Array.prototype.reduce()`. * Utilizing libraries like Lodash or Underscore.js, which provide more functional programming-inspired methods for working with arrays. In summary, this benchmark compares the performance of two methods: `Array.from()` and `Array.prototype.slice.call(testIterable())`. While `Array.from()` is a modern and efficient approach, `Array.prototype.slice.call()` works across different browsers and versions.
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