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Array.prototype.concat vs spread operator with no damn jq
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
5 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 ]
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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. **What is being tested?** The provided JSON represents a benchmark test that compares two different ways to concatenate arrays in JavaScript: `Array.prototype.concat` and the spread operator (`...`). **Options compared:** 1. **Array.prototype.concat**: This method takes one or more arrays as arguments and returns a new array containing all elements from each input array. 2. **Spread operator (`...`)**: A newer syntax (introduced in ES6) that allows expanding an iterable (such as an array) into individual elements. **Pros/Cons of different approaches:** 1. **Array.prototype.concat**: * Pros: Well-established, widely supported, and easy to use. * Cons: May be slower than the spread operator for large arrays or complex concatenations. 2. **Spread operator (`...`)**: * Pros: Can be more concise and expressive, especially when working with arrays of objects or nested structures. * Cons: Introduced in ES6 (2015), so may not be supported in older browsers or environments. **Library used:** None. This test case doesn't use any external library. **Special JS feature or syntax used:** 1. **Spread operator (`...`)**: This is the special JavaScript feature being tested. 2. **Array.prototype.concat**: A built-in method on the `Array` prototype, which is not a special feature but rather a standard method in JavaScript. **Other alternatives:** In addition to these two options, you can also use: 1. **Concatenating with `push()`**: You can iterate over each array and push its elements into a new array using `push()`. 2. **Using a library like Lodash or Underscore**: These libraries provide various concatenation functions that might be more efficient or convenient than the above options. 3. **Using modern JavaScript features like `flat()`**: This method can be used to concatenate arrays and flatten nested arrays in one step. The test case uses the spread operator (`...`) to concatenate two arrays: `[1, 2]` and `[ "hello", true, 7 ]`. The benchmark results show that the spread operator is significantly faster than `Array.prototype.concat` on this particular test case.
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