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Array.prototype.concat vs spread operator with more numbers
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
7 years ago
by:
Guest
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Tests:
Array.prototype.concat
var first = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20] var second = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20] var other = first.concat(second);
spread operator
var first = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20] var second = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20] var other = [ ...first, ...second ]
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Array.prototype.concat
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 dive into the explanation of the provided benchmark. **Benchmark Definition** The benchmark compares two approaches for concatenating arrays in JavaScript: the traditional `Array.prototype.concat()` method and the new ES6 spread operator (`[ ... ]`). **Options Compared** 1. **Traditional `concat()` method**: This is a built-in method on the Array prototype that creates a new array by appending all elements from one or more source arrays. 2. **Spread Operator (`[ ... ]`)**: This is a syntax feature introduced in ES6 that allows you to spread the elements of an array into another array. **Pros and Cons** * **Traditional `concat()` method**: + Pros: widely supported, well-documented, and familiar to many developers. + Cons: creates a new array, which can lead to memory overhead for large arrays. * **Spread Operator (`[ ... ]`)**: + Pros: more concise, efficient (as it doesn't create a new array), and easier to read. + Cons: requires modern JavaScript version support and may not work in older browsers. **Library/Tool Used** None. This benchmark is testing pure JavaScript code. **Special JS Feature/Syntax** The spread operator (`[ ... ]`) is a feature introduced in ES6 (ECMAScript 2015). It allows you to spread the elements of an array into another array, as shown in the benchmark's second test case. **Other Alternatives** If you need to concatenate arrays in older JavaScript versions or browsers that don't support the spread operator, you can use other approaches, such as: * `Array.prototype.push()`: adding each element from one array to another using `push()`. * `Array.prototype.splice()`: modifying an existing array by removing elements and then inserting new elements from another array. * Using a library like Lodash, which provides a `concat` function that can be used for concatenating arrays. It's worth noting that modern JavaScript versions (ES6+ and beyond) and most modern browsers support the spread operator, making it a convenient and efficient choice for concatenating arrays.
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