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Array population test
(version: 0)
Comparing performance of:
new Array vs brackets
Created:
9 years ago
by:
Guest
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Script Preparation code:
var size = 1000;
Tests:
new Array
var data = new Array(size); for(var index = 0; index < size; index++){ data.unshift({}); }
brackets
var data = []; for(var index = 0; index < size; index++){ data.unshift({}); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
new Array
brackets
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 world of JavaScript microbenchmarks. **Benchmark Overview** The provided benchmark is designed to measure the performance difference between two approaches for creating an array in JavaScript: using `Array()` and using square brackets `[]`. **Test Cases** There are two test cases: 1. **new Array**: This approach creates a new array instance using the `Array()` constructor. The code uses `unshift` method to add objects to the end of the array, but this is not the most efficient way to populate an array. 2. **brackets**: This approach uses square brackets `[]` to create an array and populates it with objects using `unshift`. This is a more modern and efficient way to create arrays in JavaScript. **Pros and Cons** Here's a brief summary of the pros and cons of each approach: * **new Array** + Pros: Still widely supported, might be faster for very large datasets. + Cons: Less efficient than `[]` due to the use of `unshift`, which requires shifting elements down the array. * **brackets (Array [])** + Pros: More modern and efficient, avoids shifting elements during push operations. + Cons: Requires modern JavaScript features (ES6+) and might not be supported by older browsers. **Library Usage** In this benchmark, no libraries are explicitly mentioned. However, if the test case uses a library like Lodash, which provides the `unshift` method for arrays, it would be worth noting that the performance difference between these two approaches would likely be less significant compared to the differences seen without any additional dependencies. **Special JS Features** The benchmark does not use any special JavaScript features such as `let`, `const`, or arrow functions. However, if you were to modify the test cases to use these features, it might affect the results. **Alternative Approaches** Other approaches for creating arrays in JavaScript include: * **concat**: Using the `concat` method to concatenate an array of values. * **Array.prototype.push()**: Using the `push` method to add elements to the end of an existing array. * **Array.from()**: Using the `from()` constructor to create a new array from an iterable (e.g., an array, string, or map). These approaches might be worth testing in future benchmarks to compare their performance with `new Array()` and square brackets `[]`.
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