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Array.prototype.slice vs spread operator [new]
(version: 0)
Compare the new ES6 spread operator with the traditional slice() method
Comparing performance of:
Array.prototype.slice vs spread operator
Created:
4 years ago
by:
Guest
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Tests:
Array.prototype.slice
var params = [ "hello", true, 7 ]; var other = params.slice();
spread operator
var params = [ "hello", true, 7 ] var other = [ ...params ]
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Suite status:
<idle, ready to run>
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Test case name
Result
Array.prototype.slice
spread operator
Fastest:
N/A
Slowest:
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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 measures the performance of two approaches to create a new array from an existing one: 1. `Array.prototype.slice()` 2. The new ES6 spread operator (`...`) **What is being tested?** For each individual test case, the benchmark tests which approach creates the new array with fewer operations and better performance. **Individual Test Cases** Let's analyze each test case: ### 1. `var params = [ "hello", true, 7 ]; var other = params.slice();` In this test case, a sample array `params` is created with three elements: a string, a boolean, and a number. The benchmark then measures the performance of creating a new array `other` by calling `Array.prototype.slice()` on `params`. **Pros of using `slice()`:** * It's a well-established method for creating a shallow copy of an array. * It's available in older browsers that don't support the spread operator. **Cons of using `slice()`:** * It can be slower than the spread operator, especially for large arrays. * It requires calling a method on the original array object. ### 2. `var params = [ "hello", true, 7 ]; var other = [ ...params ];` In this test case, another sample array `params` is created with three elements, and then a new array `other` is created by using the spread operator (`[ ...params ]`) to create a shallow copy of `params`. **Pros of using the spread operator:** * It's faster than `slice()` for large arrays. * It creates a new, shallow copy of the original array without modifying it. **Cons of using the spread operator:** * It requires support for the ES6 spread operator, which may not be available in older browsers. * It can have unexpected behavior if used with certain types of objects or arrays (e.g., `Array.prototype.map()`). **Other Considerations** The benchmark assumes that the input arrays are created using a specific syntax (`var params = [ ... ];`). This is just one possible way to create an array, and different implementations may use alternative syntax (e.g., `var params = Array(3);`). **Library Usage** In both test cases, no libraries are used. The spread operator is a built-in feature of modern JavaScript, while `Array.prototype.slice()` is also part of the standard library. **Special JS Feature/Syntax** The benchmark uses ES6 syntax (spread operator) and assumes that it's supported in the browsers being tested. This means that users testing on older browsers may not be able to run this benchmark as-is. **Alternatives** Other alternatives for creating a new array from an existing one include: * `Array.from()`: A newer method introduced in ES2015, which creates a new array from an iterable (e.g., a string or an object). * `Array.prototype.concat()`: Another method that concatenates one or more arrays into a single array. However, these alternatives are not tested in this benchmark.
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