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Array.prototype.concat vs spread operator vs contact empty array with 2 arrays
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator vs Concat empty array
Created:
3 years ago
by:
Guest
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Tests:
Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
Concat empty array
var params = [ "hello", true, 7 ]; var other = [].concat([1, 2], params);
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Suite status:
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Result
Array.prototype.concat
spread operator
Concat empty array
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Autogenerated LLM Summary
(model
llama3.1:latest
, generated one year ago):
Let's dive into the details of this benchmark. **Benchmark Description** The benchmark compares three different ways to concatenate arrays in JavaScript: `Array.prototype.concat`, the spread operator (`...`), and concatenating an empty array with two other arrays. **Test Cases** There are three test cases: 1. **Array.prototype.concat**: This test uses the traditional `concat()` method to concatenate two arrays. * Code: `[1, 2].concat([ "hello", true, 7 ])` * Library: None * Special JS feature/syntax: None * Description: The `concat()` method creates a new array that contains all elements from the original array and the specified array(s). * Pros: + Well-established and widely supported. + Easy to understand and use. * Cons: + Can be slower than other methods for large arrays. 2. **Spread operator**: This test uses the spread operator (`...`) to concatenate two arrays. * Code: `[1, 2, ...[ "hello", true, 7 ]]` * Library: None * Special JS feature/syntax: Spread operator (`...`) * Description: The spread operator unpacks an array into individual elements, which can then be concatenated with another array. * Pros: + More concise and readable than `concat()` for simple cases. + Can improve performance in some scenarios. * Cons: + May not be as well-established or widely supported as `concat()`. + Can be slower than `concat()` for very large arrays. 3. **Concat empty array**: This test concatenates an empty array with two other arrays using the `concat()` method. * Code: `[] .concat([1, 2], [ "hello", true, 7 ])` * Library: None * Special JS feature/syntax: None * Description: Creating an empty array and then concatenating it with other arrays can be a more efficient approach than using `concat()` directly. * Pros: + Can improve performance in some scenarios by avoiding the creation of intermediate arrays. * Cons: + May not be as intuitive or easy to understand as the other methods. **Latest Benchmark Results** The latest benchmark results show that: * The spread operator (`...`) is the fastest method, with an average execution rate of 165689824.0 per second on a mobile Safari device running iOS 16.1. * `Array.prototype.concat` is slower, with an average execution rate of 12342266.0 per second on the same device. * Concatenating an empty array is even slower, with an average execution rate of 3831363.25 per second on the same device. **Other Alternatives** If you're looking for alternative ways to concatenate arrays in JavaScript, consider using: * `Array.prototype.push`: You can use `push()` to add individual elements from one array to another. * `Map` or `Set` operations: If you need to perform more complex operations on your data, consider using a `Map` or `Set` instead of an array. Remember that the best approach depends on your specific use case and requirements.
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Array.prototype.concat vs spread operator on small array
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