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push or spread
(version: 0)
test test
Comparing performance of:
push vs spread
Created:
4 years ago
by:
Guest
Jump to the latest result
Tests:
push
var arr = []; var count = 1000; for(var i = 0; i<count; i++) { arr.push(i); }
spread
var arr = []; var count = 1000; for(var i = 0; i<count; i++) { arr = [...arr, i]; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
push
spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview of the Benchmark** MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The benchmark in question tests two different approaches for adding elements to an array: using the `push()` method or the spread operator (`...`). We will break down what is being tested, compare the options, discuss pros and cons, and explore other considerations. **What is Being Tested** The benchmark defines two test cases: 1. **Push**: The test creates an empty array `arr` and pushes 1000 elements onto it using a `for` loop. 2. **Spread**: The test creates an empty array `arr` and uses the spread operator to add 1000 elements to it using another `for` loop. **Options Compared** The two options being compared are: 1. **Push() method**: This is a built-in JavaScript method that appends a value to an array. 2. **Spread operator (`...`)**: This is a syntax introduced in ECMAScript 2015 (ES6) that allows creating new arrays by spreading the elements of an existing array. **Pros and Cons** 1. **Push() method**: * Pros: + Widely supported across browsers. + Efficient for large arrays, as it only modifies the original array. * Cons: + Can lead to slower performance due to the need to create a new array copy when using `push()` on a large array. 2. **Spread operator (`...`)**: * Pros: + More concise and expressive syntax for creating new arrays. + No need to create a new array copy, as it only creates references to the original elements. * Cons: + May lead to slower performance due to the need to concatenate elements in older browsers or when working with very large arrays. **Library and Special JS Features** There are no libraries used in this benchmark. However, the use of ES6 syntax (`...`) is a special feature introduced in ECMAScript 2015 (ES6). **Other Considerations** 1. **Browser Support**: MeasureThat.net uses various browsers to run the benchmarks. In this case, both push and spread operations are supported by Mobile Safari 12 on iOS 12.5.4. 2. **Device Platform**: The benchmark is ran on a mobile device (iPhone), which may affect performance due to hardware limitations. **Alternatives** Other alternatives for adding elements to an array include: 1. **Concat() method**: This method concatenates two or more arrays and returns the new concatenated array. 2. **Array.from() method**: This method creates a new array from an iterable, such as an array of numbers or a string. These alternatives may offer different performance characteristics and syntax styles compared to push() and spread().
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