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Array.prototype.slice vs spread operator!111
(version: 0)
Compare the new ES6 spread operator with the traditional slice() method
Comparing performance of:
Array.prototype.slice vs spread operator
Created:
2 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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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 options, pros and cons, and other considerations. **What is being tested?** The benchmark compares two approaches to create a copy of an array: 1. `Array.prototype.slice()` 2. The new ES6 spread operator (`[ ...params ]`) These methods are used to create a shallow copy of an array in JavaScript. **Options compared:** * **Slice method**: This is the traditional way to create a copy of an array in JavaScript. It takes two arguments, `start` and `end`, which define the portion of the original array to be copied. * **Spread operator**: This is a new feature introduced in ES6 that allows you to spread the elements of an array into a new array. **Pros and Cons:** * **Slice method**: + Pros: - Well-established, widely supported, and easy to use. + Cons: - Can be slower than the spread operator for large arrays. - Creates a shallow copy, which means that if the original array contains mutable objects (e.g., arrays or objects), modifying those objects in the new array will affect the original array as well. * **Spread operator**: + Pros: - Faster and more efficient than the slice method for large arrays. - Creates a shallow copy, just like the slice method. + Cons: - Introduced relatively recently, so support might not be as widespread as the slice method. - Can be less intuitive to use, especially for developers who are not familiar with ES6 features. **Library usage:** There is no library used in this benchmark. The code snippets provided only demonstrate basic JavaScript syntax. **Special JS feature or syntax:** The spread operator (`[ ...params ]`) is a new feature introduced in ES6. It allows you to spread the elements of an array into a new array, creating a copy of the original array. **Other alternatives:** * **Array.prototype.concat()**: This method creates a new array and copies elements from the original array to it. * **Array.prototype.slice.call()**: This method takes an array as an argument and returns a new array with the same elements. (Note that this is not exactly equivalent to the spread operator, which creates a shallow copy.) In terms of performance, the benchmark likely aims to compare the efficiency of these two methods in creating a copy of an array. The provided latest benchmark results show that: * Chrome 114 on Linux Desktop executed `Array.prototype.slice()` approximately 1.59 times faster than the spread operator. * The spread operator created more executions per second than the slice method, but this might be due to other factors such as browser-specific optimizations or differences in execution frequency. Keep in mind that the results may vary depending on the specific use case and JavaScript environment.
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