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Array.prototype.slice vs spread operator copy performance
(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
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Measuring performance differences between programming approaches is crucial in ensuring efficient and scalable software development. **Benchmark Overview** The provided benchmark compares the performance of two approaches to create a copy of an array: the traditional `Array.prototype.slice()` method and the new ES6 spread operator (`[...array]`). This comparison aims to determine which approach is faster, more efficient, and suitable for various use cases. **Options Compared** Two options are compared: 1. **Traditional Approach: Array.prototype.slice()** * This method creates a shallow copy of an array. * It's a widely supported method that has been part of the JavaScript language since its inception. 2. **New ES6 Spread Operator: [...array]** * This method creates a new array by spreading the elements of an existing array. * Introduced in ECMAScript 2015 (ES6), it provides a concise and expressive way to create copies. **Pros and Cons** ### Array.prototype.slice() Pros: * **Wide support**: This method has been part of JavaScript for a long time, ensuring broad compatibility across different browsers and environments. * **Well-understood behavior**: The `slice()` method is well-documented and easy to use, making it a familiar choice for many developers. Cons: * **Performance overhead**: Creating an array copy using the spread operator can be faster than the traditional `slice()` method. * **Less concise syntax**: The spread operator requires parentheses and a comma-separated list of elements, which can make the code slightly less readable. ### New ES6 Spread Operator Pros: * **Concise syntax**: The spread operator allows for a more compact representation of array copying. * **Performance benefits**: In some cases, it might outperform traditional methods like `slice()`. * **Modern feel**: Using the spread operator can give code a more modern and idiomatic look. Cons: * **Newer method**: While widely supported, this method is still relatively new compared to `slice()`. * **Potential inconsistencies**: Some older browsers or environments might not support the spread operator. **Library Usage** Neither of the two methods explicitly uses any libraries. They are part of the JavaScript language itself. **Special JS Features/Syntax** The benchmark does not test special JavaScript features or syntax beyond the use of the ES6 spread operator and `Array.prototype.slice()`.
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