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Array concat vs spread operator vs push *1000
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method and push, with target array growing
Comparing performance of:
Array.prototype.concat vs spread operator vs Push vs Push with spread
Created:
2 years ago
by:
Guest
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Tests:
Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ]; for (var i = 0; i < 1000; i++) { other.concat(params); }
spread operator
var params = [ "hello", true, 7 ]; var other = [ 1, 2]; for (var i = 0; i < 1000; i++) { other = [...other, ...params ] }
Push
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ]; for (var i = 0; i < 1000; i++) { params.forEach((param) => other.push(param)); }
Push with spread
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ]; for (var i = 0; i < 1000; i++) { other.push(...params); }
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Suite status:
<idle, ready to run>
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Test case name
Result
Array.prototype.concat
spread operator
Push
Push with spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, compared, and analyzed. **Benchmark Overview** The website MeasureThat.net provides a platform to compare performance of different JavaScript operations. The current benchmark compares three ways to add elements to an array: 1. `Array.prototype.concat()` 2. Spread operator (`...`) 3. `push()` method Each test case uses a similar scenario: creating an array `params` with some initial values and another array `other`. Then, they loop 1000 times, adding the same `params` array to `other` using each of the three methods. **Options Compared** The benchmark compares the performance of: 1. **Array.prototype.concat()**: The traditional method for concatenating arrays. 2. **Spread operator (`...`)**: A new JavaScript feature introduced in ES6, allowing for more concise array creation and manipulation. 3. **`push()` method**: A simple way to add elements to an array. **Pros and Cons of Each Approach** 1. **Array.prototype.concat()**: * Pros: Well-established, easy to use, and widely supported. * Cons: Can be slow for large arrays due to the creation of a new intermediate array. 2. **Spread operator (`...`)**: * Pros: More concise, efficient, and flexible than traditional concatenation methods. * Cons: Requires modern browsers (ES6+ support) and can be less intuitive for some developers. 3. **`push()` method**: * Pros: Simple, fast, and widely supported across all browsers. * Cons: Can lead to slower performance when dealing with large arrays due to the overhead of array resizing. **Library Usage** None of the test cases use any external libraries or frameworks that affect their performance. **Special JavaScript Features** 1. The spread operator (`...`) is a new ES6 feature that allows for more concise array creation and manipulation. It's widely supported in modern browsers, but may not work in older browsers. 2. The `push()` method is a native JavaScript function and doesn't require any special features. **Other Considerations** 1. **Array resizing**: When using the `push()` method, arrays resize automatically to accommodate added elements. This can lead to slower performance due to the overhead of array resizing. The spread operator avoids this issue by creating a new array. 2. **Intermediate array creation**: In the case of `Array.prototype.concat()`, an intermediate array is created before returning the concatenated result. This can also impact performance, especially for large arrays. **Alternatives** If you're interested in exploring alternative methods or variations on these approaches, consider: 1. Using `Array.prototype.push.apply()` instead of `push()`: While it's not as straightforward as using `push()`, this method allows for more control over the array resizing process. 2. Exploring other array manipulation techniques, such as using `slice()` and `concat()` together or utilizing modern JavaScript features like `Set` data structures. Keep in mind that these alternatives may not always provide better performance or readability, so it's essential to evaluate their trade-offs before adopting them in your code.
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Array.prototype.concat vs spread operator on large array
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