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Array.prototype.concat vs spread operator1223
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
7 years ago
by:
Guest
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Tests:
Array.prototype.concat
var params = [3, 4, 1, 3, 5, 6, 3]; var other = params.concat().sort((a, b) => a - b);
spread operator
var params = [3, 4, 1, 3, 5, 6, 3]; var other = [...params].sort((a, b) => a - b);
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Suite status:
<idle, ready to run>
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Test case name
Result
Array.prototype.concat
spread operator
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Autogenerated LLM Summary
(model
llama3.1:latest
, generated one year ago):
Let's dive into the details of this benchmark. **What is being tested?** The test case is comparing two ways to concatenate (merge) arrays in JavaScript: 1. Using the traditional `Array.prototype.concat()` method 2. Using the ES6 spread operator (`...`) **The Test Cases:** There are two test cases, each with a simple script that creates an array of numbers and then merges it with another array using either the `concat()` method or the spread operator. 1. **"Array.prototype.concat"**: This test case uses the traditional `concat()` method to merge the arrays. * Script: `var params = [3, 4, 1, 3, 5, 6, 3]; var other = params.concat().sort((a, b) => a - b);` 2. **"spread operator"**: This test case uses the ES6 spread operator (`...`) to merge the arrays. * Script: `var params = [3, 4, 1, 3, 5, 6, 3]; var other = [...params].sort((a, b) => a - b);` **The Library:** None. **Special JS Feature or Syntax:** Yes. The spread operator (`...`) is an ES6 feature that allows you to merge multiple arrays into one array. It's a concise way to concatenate arrays without the need for `concat()`. **Pros and Cons of Each Approach:** 1. **Array.prototype.concat()**: This method has been around since JavaScript 1.0. It creates a new array by copying all elements from the original array(s) and appending them to the result. * Pros: + Well-established and widely supported + Easy to understand for developers familiar with older versions of JavaScript * Cons: + Can be slower than spread operator in modern browsers (due to overhead of creating a new array) 2. **Spread Operator (`...`)**: This feature is part of the ES6 standard. * Pros: + More concise and expressive syntax + Can be faster than `concat()` in modern browsers (as it avoids the need for creating a new array) * Cons: + May not work in older browsers that don't support ES6 features **Other Alternatives:** You can also use other methods to merge arrays, such as: 1. Using a simple loop to push elements from one array to another. 2. Utilizing the `reduce()` method or other functional programming techniques. However, these alternatives may not be as efficient or concise as using the spread operator. **Benchmark Result:** The latest benchmark result shows that the spread operator outperforms the traditional `concat()` method in terms of executions per second (3117269.5 vs 2356888.5). This suggests that the spread operator is a faster and more efficient way to merge arrays, especially in modern browsers. Keep in mind that benchmark results may vary depending on specific use cases, browser versions, and other factors.
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