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Push vs spread LA2
(version: 0)
Comparing performance of:
push vs spread
Created:
2 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var arr1 = []; var arr2 = [];
Tests:
push
arr1.push({x: '1'})
spread
arr2 = [...arr2, {x: '1'}]
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
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided JSON data and explain what's being tested, compared, and discussed in this JavaScript microbenchmark. **Benchmark Definition** The benchmark definition is represented by a JSON object with the following properties: * `Name`: A unique identifier for the benchmark (in this case, "Push vs spread LA2"). * `Description`: A brief description of the benchmark (left blank). * `Script Preparation Code` and `Html Preparation Code`: These properties specify code that should be executed before running the benchmark. In this case, both are simple array declarations (`arr1 = []` and `var arr2 = []`). The purpose of these scripts is to create two empty arrays on which the benchmark will operate. **Individual Test Cases** The benchmark consists of multiple test cases, each represented by an object within a JSON array: * Each test case has a unique `Test Name`. * The `Benchmark Definition` property specifies the JavaScript code that will be executed for each test case. + For the "push" test case: `arr1.push({x: '1'})`. This creates a new element on the end of an array using the `push()` method. + For the "spread" test case: `arr2 = [...arr2, {x: '1'}]`. This creates a new element on the end of an array using the spread operator (`...`). * Each test case has its own execution results, which will be discussed later. **Library and Special JS Features** In this benchmark, two JavaScript libraries/libraries functions are used: * The `push()` method is part of the Array prototype in JavaScript. * The spread operator (`...`) is also part of the JavaScript language. No special features or syntax (like async/await or generators) are being tested here. These test cases focus on basic array operations using standard JavaScript methods. **Comparison and Pros/Cons** The two test cases, "push" and "spread", compare the performance of creating a new element on an array: * `push()`: + Pros: Simple, widely supported (all modern browsers), and well-optimized. + Cons: May incur additional overhead due to the need for a hash table lookup during insertion. * `Spread Operator` (`...`): + Pros: More concise, can be faster for large arrays, and provides a more intuitive way of creating new arrays. + Cons: Less supported in older browsers (IE 11 or earlier), may incur additional overhead due to the need for a heap allocation. **Other Alternatives** If you were to implement this benchmark with alternative approaches, some options might include: * Using `Array.prototype.concat()` instead of spread operator. * Creating an array using the `Array.from()` method instead of push(). * Using a different data structure (e.g., linked lists or custom arrays) for comparison. These alternatives would require significant changes to the benchmark code and are likely not as representative of real-world scenarios, but they could provide interesting insights into different performance characteristics.
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