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Array.prototype.slice vs spread operator 123123123
(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 ]; 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:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and explain what's being tested. **Benchmark Overview** The benchmark compares two approaches to create a shallow copy of an array: `Array.prototype.slice()` and the new ES6 spread operator (`...`). **Options Compared** There are only two options being compared: 1. **Array.prototype.slice()**: This is the traditional method for creating a shallow copy of an array in JavaScript. It takes the starting index and ending index as arguments, allowing you to create a new array with a subset of elements from the original array. 2. **Spread Operator (`...`)**: This is a new feature introduced in ES6 that allows you to create a new array by spreading the elements of an existing array. **Pros and Cons** **Array.prototype.slice()**: Pros: * Widely supported across different browsers and versions * Easy to use and understand * Can be used with arrays of any type (not just primitive values) Cons: * Creates a new object, which can lead to memory issues if not properly garbage collected * Can be slower than the spread operator for large arrays **Spread Operator (`...`)**: Pros: * More concise and readable than `Array.prototype.slice()` * Faster execution time for large arrays * Supports arrays of any type (including objects) Cons: * Not supported in older browsers or versions (e.g., IE 11) * Can lead to more complex error messages if not used correctly **Library Used** There is no explicit library mentioned in the benchmark definition. However, it's likely that the `Array.prototype.slice()` method is using native JavaScript functionality. **Special JS Feature/Syntax** The spread operator (`...`) was introduced in ES6 and is a new feature in JavaScript. It allows you to create a new array by spreading the elements of an existing array or object. **Other Alternatives** If you wanted to compare other approaches, some alternatives could be: * `Array.prototype.concat()`: Similar to `slice()`, but concatenates arrays instead of creating a shallow copy. * `Array.from()`: A more modern method for creating arrays from iterables (e.g., arrays, strings). * `Object.assign()`: A method for copying objects or arrays. However, these alternatives are not being tested in this specific benchmark.
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