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Concat array concat, spread, push spread
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator vs push spread operator
Created:
2 years ago
by:
Guest
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Tests:
Array.prototype.concat
const params = [ "hello", true, 7 ]; const other = [ 1, 2 ].concat(params);
spread operator
const params = [ "hello", true, 7 ] const other = [ 1, 2, ...params ]
push spread operator
const params = [ "hello", true, 7 ]; const other = [ 1, 2 ].push(...params);
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Suite status:
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Test case name
Result
Array.prototype.concat
spread operator
push spread operator
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Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and its test cases to understand what is being tested. **Benchmark Definition JSON** The benchmark definition defines three different approaches for concatenating arrays: traditional `concat()`, spread operator (`...`), and push spread operator (`push(...)`). * **Traditional `concat()`**: This method uses the `concat()` function to merge two or more arrays. * **Spread Operator (`...`)**: Introduced in ES6, this operator allows you to expand an iterable (like an array) into individual elements. * **Push Spread Operator (`push(...)`)**: Similar to the spread operator, but it's used with the `push()` method to add new elements to an existing array. **Test Cases** There are three test cases: 1. **Array.prototype.concat**: This test case uses the traditional `concat()` method to concatenate two arrays: `[ 1, 2 ]` and `params`. 2. **Spread Operator**: This test case uses the spread operator (`...`) to expand the `params` array into individual elements and merge them with the existing array `[ 1, 2 ]`. 3. **Push Spread Operator**: This test case uses the push spread operator (`push(...)` to add new elements from the `params` array to the existing array `[ 1, 2 ]`. **Library and Special JS Features** * The benchmark doesn't use any external libraries. * There are no special JavaScript features or syntax being tested. **Pros and Cons of Different Approaches** * **Traditional `concat()`**: This method is widely supported across most browsers and can be a good fallback for older environments. However, it may not be as efficient as the other two methods due to its overhead. * **Spread Operator (`...`)**: This operator is relatively new (introduced in ES6) but has become widely adopted. It's generally more efficient than `concat()` and provides a concise way to merge arrays. However, some older browsers might not support it yet. * **Push Spread Operator (`push(...)`):** Similar to the spread operator, this method is also relatively new and only available in modern browsers. **Other Alternatives** If you wanted to test alternative approaches for concatenating arrays, here are a few examples: * Using `Array.prototype.reduce()` or `Array.prototype.forEach()` * Using `Array.prototype.slice()` with two arguments * Using `new Array().push(...)` (although this method has some performance implications) Keep in mind that these alternatives might not be as efficient or widely supported as the traditional `concat()` method, and their performance may vary depending on the specific use case. Overall, this benchmark provides a good comparison between three popular methods for concatenating arrays in JavaScript, allowing developers to see which approach performs best in different browsers and environments.
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