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JS Array Conct vs Spread
(version: 0)
Comparing performance of:
Array.prototype.concat vs spread operator vs JQuery merge
Created:
6 years ago
by:
Guest
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HTML Preparation code:
<script src='https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js'></script>
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)
Previous results
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Test case name
Result
Array.prototype.concat
spread operator
JQuery merge
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON and explain what's being tested, the options compared, their pros and cons, and other considerations. **Benchmark Definition** The benchmark is created using MeasureThat.net, which allows users to create and run JavaScript microbenchmarks. The benchmark definition includes: * `Name`: The name of the benchmark. * `Description`: A brief description of the benchmark (not provided in this case). * `Script Preparation Code`: The code that prepares the script for execution (not provided in this case). * `Html Preparation Code`: The HTML code that sets up the environment for the benchmark (a link to jQuery 1.12.0). **Individual Test Cases** The benchmark consists of three test cases: 1. **Array.prototype.concat** * Benchmark Definition: `var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);` * Test Name: `Array.prototype.concat` This test case is comparing the performance of the built-in `concat` method for arrays. 2. **Spread Operator** * Benchmark Definition: `var params = [ "hello", true, 7 ]; var other = [ 1, 2, ...params ]` * Test Name: `spread operator` This test case is comparing the performance of the spread operator (`...`) when used to expand an array. 3. **JQuery merge** * Benchmark Definition: `var params = [ "hello", true, 7 ]; var other = $.merge([1, 2], params)` * Test Name: `JQuery merge` This test case is comparing the performance of jQuery's `$.merge` method when used to merge two arrays. **Library and Purpose** The only library mentioned in this benchmark is jQuery (version 1.12.0). It provides a way to perform DOM manipulation, event handling, and other tasks. In this context, it's being used for the `$.merge` method. **Special JS Features or Syntax** The spread operator (`...`) is a relatively recent addition to JavaScript, introduced in ECMAScript 2018 (ES8). It allows arrays to be expanded by spreading their elements into another array. **Pros and Cons of Different Approaches** Here's a brief summary of the pros and cons of each approach: 1. **Array.prototype.concat**: This method is built-in to JavaScript and has good performance. * Pros: Fast, widely supported, and easy to use. * Cons: May not be suitable for very large arrays. 2. **Spread Operator (ES8)**: This operator allows for more concise code and can lead to better readability. * Pros: Concise syntax, efficient execution. * Cons: Requires support for ES8, may not work in older browsers or environments. 3. **JQuery merge**: Using jQuery's `$.merge` method can be convenient but also introduces additional overhead due to the library. * Pros: Convenient, easy to use, and often includes other useful methods. * Cons: Introduces additional complexity and potential performance issues. **Other Considerations** When choosing between these approaches, consider factors such as: * Performance requirements * Code readability and maintainability * Browser support (for spread operator) * Library dependencies (for jQuery) **Alternatives** If you're interested in exploring other alternatives for array concatenation or expansion, here are a few options: 1. `Array.prototype.push()`: This method can be used to append elements to an existing array. 2. `Array.prototype.unshift()`: This method can be used to add elements to the beginning of an existing array. 3. `concat()`: Some other libraries or frameworks might provide alternative methods for concatenating arrays. I hope this explanation helps you understand what's being tested in the provided benchmark!
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