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slice vs spread, blahhh
(version: 0)
Compare the new ES6 spread operator with the traditional slice() method
Comparing performance of:
Array.prototype.slice vs spread operator
Created:
5 years ago
by:
Guest
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Tests:
Array.prototype.slice
var params = [ "hello", true, 7, {a:1}, {a:1}, {a:1}, {a:1}, {a:1}, {a:1} ]; var other = params.slice();
spread operator
var params = [ "hello", true, 7, {a:1}, {a:1}, {a:1}, {a:1}, {a:1}, {a:1} ]; var other = [ ...params ]
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Suite status:
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Result
Array.prototype.slice
spread operator
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, compared, and their pros and cons. **Benchmark Overview** The benchmark compares two ways to create a shallow copy of an array in JavaScript: using the traditional `Array.prototype.slice()` method versus the new ES6 spread operator (`[...]`). **Options Compared** 1. **Traditional `Array.prototype.slice()`:** * This method creates a shallow copy of a portion of an array, preserving the original data structure. * Pros: + Well-established and widely supported in older browsers. + Easy to understand and implement. * Cons: + May not be as efficient as other methods for large arrays. + Can lead to unexpected behavior if the original array has mutable properties. 2. **Spread Operator (`[...]`):** * This method creates a new array by spreading an existing array or values into a new array. * Pros: + More modern and efficient than `slice()` for large arrays. + Less prone to unexpected behavior due to mutable properties. * Cons: + Requires a newer JavaScript engine (ES6+) that supports the spread operator. + May not be as widely supported in older browsers. **Library Used** There is no specific library used in this benchmark. The `slice()` method and the spread operator are both part of the built-in JavaScript API. **Special JS Feature/Syntax** The benchmark uses the ES6 spread operator (`[...]`), which was introduced in ECMAScript 2015 (ES6). This feature allows for a more concise way to create new arrays from existing ones. **Other Alternatives** If you need to create a shallow copy of an array, other alternatives include: * `Array.prototype.slice().concat()`: A variation of the traditional `slice()` method that preserves the original data structure. * `Object.assign()`: Can be used to create a shallow copy of an object or array by spreading its properties into a new object or array. In conclusion, this benchmark compares two common ways to create a shallow copy of an array in JavaScript: using the traditional `Array.prototype.slice()` method versus the more modern and efficient spread operator (`[...]`). The choice between these options depends on the specific requirements of your project, such as browser support and performance considerations.
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