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Array.push( spread ) vs assign Array.concat()
(version: 0)
Comparing performance of:
Array.push( spread ) vs Array.concat()
Created:
6 years ago
by:
Guest
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Tests:
Array.push( spread )
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].push(...params);
Array.concat()
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
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Suite status:
<idle, ready to run>
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Test case name
Result
Array.push( spread )
Array.concat()
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Slowest:
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Autogenerated LLM Summary
(model
llama3.1:latest
, generated one year ago):
Let's dive into what this benchmark tests and what it means for software engineers. **What is being tested?** This benchmark compares the performance of two different approaches to add elements to an existing array in JavaScript: 1. **`Array.push(...params)`**: This uses the spread operator (`...`) to expand an array-like object `params` into a comma-separated list, which is then passed as arguments to the `push()` method. 2. **`Array.concat(params)`**: This directly concatenates another array (or array-like object) `params` with an existing array using the `concat()` method. **What options are being compared?** In this benchmark, two test cases are compared: 1. The first test case uses the spread operator (`...`) to add elements from `params` to an existing array `[1, 2]`, resulting in a new array with all elements. 2. The second test case directly concatenates the `params` array with an existing array using `concat()`. **Pros and cons of each approach:** * **`Array.push(...params)`**: This approach is more concise and readable when adding multiple elements to an existing array. However, it can be slower than `concat()` for large arrays, as each `push()` operation creates a new array and copies the old contents. * **`Array.concat(params)`**: This approach is generally faster than `push()` for large arrays, as it uses a single `concat()` method to create a new array with all elements. However, it can be less readable when adding multiple elements. **Other considerations:** * Both approaches have similar time complexities (O(n)) in terms of memory allocation and copying. * If the existing array is empty or has only one element, using `push()` might be slightly faster than `concat()`. * In modern JavaScript engines (e.g., V8), the performance difference between `push()` and `concat()` is relatively small, but `push()` might still have a slight advantage for large arrays. **Library usage:** None in this benchmark. The test cases only use built-in JavaScript methods (`Array.push()`, `Array.concat()`) and operators (`...` spread operator). **Special JS features or syntax:** The benchmark uses the spread operator (`...`) to expand an array-like object into a comma-separated list. **Other alternatives:** While not tested in this specific benchmark, alternative approaches exist: * Using a single `push()` method with each element as separate arguments: `other.push('hello').push(true).push(7)`. * Using the `Set` data structure to add unique elements to an existing array. * Implementing custom functions or methods for adding elements to arrays. These alternatives might be worth exploring depending on specific use cases and performance requirements.
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