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spread vs concat vs push
(version: 0)
Comparing performance of:
spread vs concat vs push
Created:
5 years ago
by:
Registered User
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Tests:
spread
var aString = 'test'; var anArray = ['test2', 'test3']; var aMergedArray = [aString, ...anArray];
concat
var aString = 'test'; var anArray = ['test2', 'test3']; var aMergedArray = anArray.concat([aString]);
push
var aString = 'test'; var anArray = ['test2', 'test3']; anArray.push(aString); var aMergedArray = anArray;
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Suite status:
<idle, ready to run>
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Test case name
Result
spread
concat
push
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and explain what's being tested. **Benchmark Purpose:** The benchmark is designed to compare the performance of three different approaches for merging an array with a string: 1. Using `...` (spread syntax) 2. Using `concat()` method 3. Using `push()` method **What are we comparing?** * The number of executions per second (i.e., how many times each approach can be executed in one second) across different browsers and devices. **Options compared:** 1. **Spread Syntax (`...`)**: This syntax allows us to merge an array with a string by creating a new array with the elements from the original array followed by the elements of the string. 2. **`concat()` method**: This method returns a new array that contains all elements from the original array, followed by the elements of the specified string or value. 3. **`push()` method**: This method adds one or more elements to the end of an array. **Pros and Cons of each approach:** * **Spread Syntax (`...`)**: + Pros: concise and readable, creates a new array with minimal overhead. + Cons: may not be supported in older browsers or versions of JavaScript. * **`concat()` method**: + Pros: widely supported across browsers and versions of JavaScript, can handle complex merging scenarios. + Cons: creates a new array, which can lead to higher memory usage and slower performance compared to the spread syntax. * **`push()` method**: + Pros: efficient use of memory, as it modifies the existing array instead of creating a new one. + Cons: may not be as readable or concise as the other two approaches, and requires understanding of how arrays work in JavaScript. **Library/Features used:** None explicitly mentioned. The benchmark only uses built-in JavaScript features and functions. **Special JS features/syntax:** The spread syntax (`...`) is a relatively recent feature introduced in ECMAScript 2015 (ES6). It's supported by most modern browsers, but may not work in older versions or non-JavaScript environments. **Other alternatives:** * Using `Array.prototype.slice()` method to create a new array with the desired elements. * Using a library like Lodash or Underscore.js for more complex merging scenarios. In summary, this benchmark compares the performance of three different approaches for merging an array with a string: spread syntax, `concat()` method, and `push()` method. The results can help developers optimize their code for better performance, especially in scenarios where memory usage is critical.
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