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Array.prototype.concat vs spread operator (minus jquery)
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
5 years ago
by:
Guest
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Tests:
Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
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Suite status:
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Test case name
Result
Array.prototype.concat
spread operator
Fastest:
N/A
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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 Definition** The benchmark being tested is the comparison between the `Array.prototype.concat` method and the new ES6 spread operator (`...`) in creating an array copy from another array. The benchmark is specifically designed to test which approach is faster, excluding jQuery as a reference implementation. **Options Compared** Two options are compared: 1. **Traditional `Array.prototype.concat()`**: This method takes two arrays as arguments and returns a new array containing all elements from both arrays. 2. **ES6 Spread Operator (`...`)**: This operator allows for the creation of a new array by iterating over an existing array and adding its elements to a new array. **Pros and Cons** * **Traditional `Array.prototype.concat()`**: + Pros: Wide support across browsers and versions, simple syntax. + Cons: Can be slow due to the need to create a new array object and iterate over both arrays. * **ES6 Spread Operator (`...`)**: + Pros: Faster performance, more concise syntax, and better support for modern browsers and versions. + Cons: May not work as expected in older browsers or versions that don't support it. **Library Used** None is explicitly mentioned in the benchmark definition. However, the use of `...` (spread operator) suggests that the benchmark assumes the presence of a JavaScript engine that supports this feature. **Special JS Feature/Syntax** The ES6 spread operator (`...`) is a modern JavaScript feature introduced in ECMAScript 2015. It allows for the creation of new arrays by spreading elements from an existing array into a new array. **Other Alternatives** Besides `Array.prototype.concat()` and the ES6 spread operator, other alternatives to create an array copy could include: * Using the `slice()` method: `var other = [ 1, 2 ].slice(0).concat([ "hello", true, 7 ])`. * Using the `reduce()` method: `var other = [ 1, 2 ].reduce((acc, curr) => acc.concat(curr), [])`.
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