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Array.prototype.concat vs spread operator this is a cool test
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
4 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
llama3.2:3b
, generated one year ago):
Let's dive into the explanation of the provided benchmark. **What is tested?** The benchmark compares the performance of two approaches to concatenate arrays: 1. `Array.prototype.concat()`: The traditional method of concatenating arrays in JavaScript, which uses the `concat()` method on the Array prototype. 2. Spread operator (`...`): A new feature introduced in ES6 (2015) that allows for spreading elements of an array into a new array. **Options compared** The benchmark compares the two options directly: * **Approach 1: `Array.prototype.concat()`**: Uses the `concat()` method to concatenate the arrays. * **Approach 2: Spread operator (`...`)**: Spreads the elements of one array into another using the spread operator (`...`). **Pros and cons** **`Array.prototype.concat()`:** Pros: * Wide support across browsers, as it's a part of the Array prototype. * Easy to understand and use for concatenating arrays. Cons: * Can be slower than the spread operator due to its overhead. **Spread operator (`...`):** Pros: * Faster performance compared to `concat()` because it avoids function call overhead. * More concise and expressive syntax. Cons: * Requires a modern JavaScript engine (ES6+) that supports this feature. * May not work in older browsers or environments. **Library usage** None mentioned explicitly, but the benchmark assumes basic JavaScript functionality is available. However, if using modern ES6+ features like spread operators, it's worth noting that some older browsers might require polyfills or additional setup to support these features. **Special JS feature/syntax** The benchmark uses a modern syntax (ES6+) with the spread operator (`...`). The test case also mentions `var` which is an older JavaScript keyword (not used in strict mode by default). **Other alternatives** In theory, other ways to concatenate arrays exist, such as using `Array.prototype.push()` or creating a new array and assigning it elements. However, these approaches are generally less efficient than the spread operator for simple concatenation scenarios. Keep in mind that this benchmark is designed to compare performance between two specific approaches, which might not be representative of real-world use cases where you would need to consider factors like cache friendliness, side effects, or other optimization strategies.
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