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Array#concat vs Array#push
(version: 0)
Comparing performance of:
Array#push vs Array#concat
Created:
3 years ago
by:
Guest
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Tests:
Array#push
let array1 = ['a', 'b', 'c']; array1.push('d');
Array#concat
let array1 = ['a', 'b', 'c']; array1.concat('d');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Array#push
Array#concat
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 provided benchmark and explain what's being tested. **What is being tested?** The benchmark compares two ways to append an element to an array in JavaScript: 1. `Array#push`: This method appends one or more elements to the end of an array. 2. `Array#concat`: This method creates a new array by concatenating another array (or values) with the existing array. **Options being compared** The benchmark is comparing the performance of these two approaches: * `Array#push` * `Array#concat` **Pros and cons of each approach** 1. `Array#push`: * Pros: Fast, efficient, and widely supported. * Cons: May not be as flexible or expressive as other methods, as it requires specifying the number of elements to append. 2. `Array#concat`: * Pros: More flexible and expressive than `Array#push`, as it allows appending multiple values without specifying their count. * Cons: Slower than `Array#push`, especially for large arrays. **Other considerations** * Both methods create a new array with the appended element(s), which can lead to memory allocation issues if not handled carefully. * In modern JavaScript, the performance difference between these two methods is relatively small, and the choice of method often depends on the specific use case or personal preference. **Library usage (none in this example)** There are no libraries mentioned in this benchmark definition. **Special JS features or syntax** The benchmark uses a feature-specific syntax for the `Array#push` and `Array#concat` methods, which may be considered outdated. However, it's still widely supported in modern browsers. **Alternative approaches** If you're looking for alternative ways to append elements to an array, some other options include: * Using the spread operator (`...array`) with `push()`: `array.push(...newArray)` * Using `unshift()` or `splice()` instead of `push()` * Creating a new array using the `Array.from()` method and pushing elements onto it: `let newArray = Array.from([], (value) => value); newArray.push(element)`
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