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Array.concat vs spread
(version: 0)
Comparing performance of:
concat vs spread
Created:
7 years ago
by:
Guest
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Tests:
concat
const a = [1, 2, 3]; const b = [4, 5, 6]; const c = a.concat(b);
spread
const a = [1, 2, 3]; const b = [4, 5, 6]; const c = [...a, ...b];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
concat
spread
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! **What is tested on MeasureThat.net?** MeasureThat.net tests different approaches to concatenating arrays in JavaScript, specifically comparing `Array.concat()` and spread syntax (`...`). **Options compared:** There are two options being compared: 1. **`Array.concat()`**: This method takes an array as an argument and returns a new array that contains all elements from the original array. 2. **Spread syntax (`...`)**: This method uses the `...` operator to create a new array by spreading the elements of another array. **Pros and Cons:** * **`Array.concat()`**: + Pros: - Wide browser support (all major browsers) - Well-documented + Cons: - Can be slower than spread syntax, especially for large arrays - Returns a new array object every time it's called, which can lead to performance issues in certain situations * **Spread syntax (`...`)**: + Pros: - Often faster than `Array.concat()`, especially for large arrays - Creates a new array without the need for explicit method calls + Cons: - Not supported in older browsers (IE 11 and below) - Can be less readable in certain situations **Library usage:** None of the test cases uses any external libraries. **Special JavaScript feature or syntax:** The `...` operator is a new feature introduced in ECMAScript 2015, also known as ES6. It allows you to create a new array by spreading elements from another array or iterable. **Other alternatives:** If `Array.concat()` and spread syntax are not available or performance-critical, other alternatives for concatenating arrays include: * Using the `+` operator to concatenate arrays (e.g., `[1, 2, 3] + [4, 5, 6]`) * Using the `Array.prototype.push()` method to add elements to an array and then creating a new array from it (e.g., `[...new Array(7).fill(null), 1, 2, 3].slice(0, 3)`) However, these alternatives are generally less efficient and less readable than using `Array.concat()` or spread syntax. Overall, the choice between `Array.concat()` and spread syntax depends on the specific use case, browser support requirements, and performance considerations.
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