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Array extend
(version: 0)
Comparing performance of:
Push single vs Push spread vs Total spread
Created:
5 years ago
by:
Guest
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Tests:
Push single
x = [1, 2, 3] y = [] x.forEach(e => y.push(e))
Push spread
x = [1, 2, 3] y = [] y = y.push(...x)
Total spread
x = [1, 2, 3] y = [] y = [...y, ...x]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Push single
Push spread
Total 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! **Benchmark Overview** The provided benchmark compares three different approaches for extending an array in JavaScript: `push`, spread operator (`...`), and total spread (`[...y, ...x]`). The test cases are designed to measure the performance differences between these approaches. **Options Compared** 1. **Push single**: Using the `push()` method to add individual elements to the end of the array. * Pros: Simple and widely supported. * Cons: Can be slower than other methods, especially for large arrays. 2. **Push spread**: Using the spread operator (`...`) to add all elements from one array to another. * Pros: Efficient and expressive way to extend an array with multiple elements. * Cons: Not all browsers support the spread operator in this context (e.g., older versions of Chrome). 3. **Total spread**: Using the spread operator (`[...y, ...x]`) to create a new array by concatenating two arrays. * Pros: More expressive and flexible than the simple `push()` method. * Cons: Can be slower due to the creation of a new array. **Library** None of the test cases explicitly use any libraries. However, it's worth noting that some JavaScript implementations (like SpiderMonkey) have built-in optimizations for certain array operations, which might affect benchmark results. **Special JS Features/Syntax** The test cases do not use any special JavaScript features or syntax beyond the standard language. The spread operator (`...`) is a relatively recent addition to the language, introduced in ECMAScript 2015 (ES6), and its usage in these test cases is likely intended to illustrate its performance characteristics. **Other Alternatives** If you're interested in exploring other approaches for extending arrays, here are a few more options: * Using `concat()` method: Similar to total spread, but creates a new array by concatenating the two arrays. * Using `Array.prototype.reduce()`: A more functional approach that can be used to extend an array. * Using a custom implementation (e.g., using a loop or recursion): These approaches might offer better performance for specific use cases. Keep in mind that the choice of method ultimately depends on your application's requirements, code readability, and personal preference.
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