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Array.prototype.concat vs spread operator number 2
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
6 years ago
by:
Guest
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Tests:
Array.prototype.concat
var params = [ "hello", true, 7 ]; var old = [1,2]; var other = [...old, ...params];
spread operator
var params = [ "hello", true, 7 ]; var old = [1,2]; var other = old.concat(params);
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Suite status:
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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 explanation. **Benchmark Definition** The benchmark is called "Array.prototype.concat vs spread operator number 2", which means it's comparing two different ways of concatenating arrays in JavaScript: `Array.prototype.concat()` and the spread operator (`...`). **Individual Test Cases** There are two test cases: 1. **"Array.prototype.concat"**: This test case uses the traditional `concat()` method to concatenate two arrays: `[1, 2]` and `["hello", true, 7]`. 2. **"spread operator"**: This test case uses the spread operator (`...`) to concatenate the same two arrays. **Library or Special JS Feature/Syntax** There are no external libraries used in this benchmark. The only special JavaScript feature used is the spread operator (`...`), which was introduced in ECMAScript 2015 (ES6). The spread operator allows you to expand an array into a new one, like this: `[1, 2]` becomes `"...[1, 2]"` without the quotes. This syntax is equivalent to using `concat()`. **Pros and Cons** Here's a brief comparison of the two approaches: * **Array.prototype.concat()**: This method is more traditional and widely supported in older browsers. However, it can be slower than the spread operator for large arrays. * **Spread Operator (`...`)**: This syntax is newer and more concise. It's faster than `concat()` for large arrays, but may have issues with older browsers that don't support ES6. **Other Alternatives** Besides these two approaches, there are other ways to concatenate arrays in JavaScript: * **Pushing elements individually**: You can use a loop to add each element from one array to another. * **Using the `push()` method with an array of arrays**: This approach is less efficient but can be useful for specific use cases. **Benchmark Result** The latest benchmark result shows that the spread operator outperforms `concat()` by a small margin (about 4.5%) on this particular test case, using Firefox 75 as the browser. Keep in mind that these results are based on a specific test case and might not generalize to all scenarios. The actual performance difference may vary depending on your use case and JavaScript engine.
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