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Concat arrays
(version: 0)
Comparing performance of:
push array destructing vs concat
Created:
5 years ago
by:
Guest
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Tests:
push array destructing
var a = []; var b = [1, 2, 3, 4, 5]; for (var i = 0; i < 1000; i++) { a.push(...b); }
concat
var a = []; var b = [1, 2, 3, 4, 5]; for (var i = 0; i < 1000; i++) { a = a.concat(b); }
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Suite status:
<idle, ready to run>
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Test case name
Result
push array destructing
concat
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to help you understand what's being tested in the provided JSON benchmark. **What is being tested?** The benchmark measures the performance of two different approaches for concatenating arrays: using the spread operator (`...`) and using the `concat()` method. The test cases are designed to simulate a common use case where an array needs to be concatenated with another array repeatedly. **Options compared** There are two options being compared: 1. **Push array destructing**: This approach uses the spread operator (`...`) to concatenate arrays. It's a more modern and concise way of concatenating arrays. 2. **Concat**: This approach uses the `concat()` method to concatenate arrays. It's a more traditional and widely supported way of concatenating arrays. **Pros and cons of each approach** 1. **Push array destructing (Spread operator)**: * Pros: More concise, faster, and more memory-efficient. * Cons: May not be as widely supported by older browsers or versions of JavaScript. 2. **Concat**: * Pros: Widely supported across all browsers and versions of JavaScript. * Cons: Less concise and less efficient than the spread operator. **Library and its purpose** None are explicitly mentioned in the provided benchmark, but it's likely that the `concat()` method is being tested in a more general sense, as it's a built-in array method. However, if you're using a library like Lodash, which provides a `concat` function for arrays, then the test is actually comparing the performance of the `concat` function from Lodash versus the native `concat` method. **Special JS feature or syntax** There are no special features or syntaxes being tested in this benchmark. The focus is solely on the performance comparison between two array concatenation approaches. **Other alternatives** If you're looking for alternative ways to concatenate arrays, some options include: 1. **Array.prototype.push() with spread operator**: `push(...arrayToConcatenate)`. This approach combines the benefits of push and spread operators. 2. **Array.prototype.reduce()**: `reduce((acc, value) => acc.concat(value), arrayToConcatenate)`. This approach uses reduce to concatenate arrays. Keep in mind that these alternatives might not be as performant or concise as the options being tested in this benchmark.
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