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Array.prototype.concat vs spread operator
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator vs jQuery merge
Created:
8 years ago
by:
Guest
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Script Preparation code:
var arr = Array(100).fill([{n: ''}]);
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 ]
jQuery merge
var params = [ "hello", true, 7 ]; var other = $.merge([1, 2], params);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
Array.prototype.concat
spread operator
jQuery merge
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the benchmark. **What is being tested?** MeasureThat.net is comparing three approaches to concatenate arrays: 1. **Array.prototype.concat()**: A traditional method that uses the `concat()` function on the `Array` prototype. 2. **Spread operator (`...`)**: A new ES6 feature that allows spreading an array's elements into a new array using the syntax `new Array([...]).push(...)` or simply `[...array]`. 3. **jQuery merge**: Using the `$.merge()` function from jQuery to concatenate arrays. **Options comparison** The three options are being compared in terms of performance, which is typically measured as the number of executions per second (ExecutionsPerSecond). * **Array.prototype.concat()**: This method creates a new array and then pushes each element from the original array into it. It's a simple but potentially slow approach. * **Spread operator (`...`)**: This method is generally faster because it only requires a single operation to create a new array with the spread elements. * **jQuery merge**: jQuery provides its own implementation of array concatenation, which might be optimized for performance. **Pros and Cons** Here's a brief summary: * **Array.prototype.concat()**: + Pros: Simple to implement, widely supported. + Cons: May be slower due to the need to create a new array. * **Spread operator (`...`)**: + Pros: Fast, modern, and widely supported. + Cons: Requires JavaScript 5.1 or later (ES6). * **jQuery merge**: + Pros: Optimized for performance, widely used in web development. + Cons: Adds an extra dependency on jQuery. **Library usage** The `$.merge()` function is part of the jQuery library. It's a utility function that allows concatenating two arrays. **Special JS feature or syntax** None mentioned in this benchmark. **Other alternatives** If you're interested in exploring other approaches, consider: * **Array.prototype.push()**: Instead of creating a new array, push elements onto the original array. * **Set**: In modern JavaScript, using `new Set()` and adding elements to it is another way to create an array-like object.
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