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Array.prototype.slice vs spread operator test
(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 = [1,2,3,4,5]; var other = params.slice();
spread operator
var params = [1,2,3,4,5]; 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 dive into the world of JavaScript microbenchmarks on MeasureThat.net. **Benchmark Overview** The benchmark compares two approaches to create a copy of an array: `Array.prototype.slice()` and the new ES6 spread operator (`[ ...params ]`). The goal is to determine which method is faster, more efficient, or both. **Options Compared** Two options are being compared: 1. **`Array.prototype.slice()`**: A traditional method for creating a shallow copy of an array. It takes two arguments: `startIndex` and `endIndex`. If omitted, it creates a copy from the start of the array to its end. 2. **New ES6 spread operator (`[ ...params ]`)**: A modern approach that uses the rest parameter syntax to create a new array with a copy of each element from the original array. **Pros and Cons** Here's a brief analysis of each approach: * **`Array.prototype.slice()`**: + Pros: Wide browser support, easy to implement, and well-documented. + Cons: Can be slower for large arrays due to the additional overhead of creating a new array object. * **New ES6 spread operator (`[ ...params ]`)**: + Pros: More concise, faster execution (especially for large arrays), and more efficient memory allocation. + Cons: Requires modern browsers that support the rest parameter syntax. **Library and Syntax** In this benchmark, no external libraries are used. The only special JavaScript feature is the new ES6 spread operator (`[ ...params ]`). **Other Considerations** When measuring the performance of array copying methods, other factors can affect results: * Array size: Larger arrays may lead to slower execution times due to increased memory allocation and garbage collection. * Browser support: Older browsers might not execute the new ES6 spread operator or `Array.prototype.slice()` correctly. * Compiler optimizations: Some compilers might optimize the code differently for each approach. **Alternatives** Other alternatives for creating a copy of an array include: * **`Array.prototype.concat()`**: Creates a new array by concatenating multiple arrays. This method can be slower and more memory-intensive than `slice()` or the spread operator. * **`Array.from()`**: A modern method that creates a new array from an iterable (e.g., a string, object, or another array). While efficient for some use cases, it might not be as fast as `slice()` or the spread operator. In conclusion, this benchmark highlights the trade-offs between traditional methods (`Array.prototype.slice()`) and modern approaches (`[ ...params ]`) when creating a copy of an array in JavaScript.
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