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Array concat vs spread operator vs push vs Array.prototype.push.apply
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method and push
Comparing performance of:
Array.prototype.concat vs spread operator vs Push vs Array.prototype.push.apply
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 ]
Push
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].push(...params);
Array.prototype.push.apply
var params = [ "hello", true, 7 ]; var other = Array.prototype.push.apply([ 1, 2 ], params);
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Suite status:
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Run tests (4)
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Test case name
Result
Array.prototype.concat
spread operator
Push
Array.prototype.push.apply
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the provided benchmark JSON and explain what's being tested. **Benchmark Definition** The benchmark is designed to compare the performance of four different methods for concatenating arrays in JavaScript: 1. `Array.prototype.concat()` 2. The spread operator (`...`) 3. `push()` with the spread operator (`...`) 4. `Array.prototype.push.apply()` **Options Compared** Each test case uses a similar input data structure, which is an array `params` containing three elements: a string, a boolean, and a number. The benchmark compares the execution time of each method for concatenating this array with another fixed-size array `[1, 2]`. **Pros and Cons of Each Approach** Here's a brief analysis of each approach: 1. **Array.prototype.concat()**: This is the traditional way to concatenate arrays in JavaScript. It creates a new array by copying elements from both arrays. While it's widely supported, it can be slow for large datasets due to the overhead of creating a new array. * Pros: Widely supported, easy to use. * Cons: Can be slow, creates a new array. 2. **Spread Operator (`...`)**: Introduced in ES6, this operator allows you to spread elements from one or more arrays into another array. It's a concise way to concatenate arrays without creating a new one. * Pros: Concise, efficient (no overhead of creating a new array). * Cons: May not work as expected if the input data is large or complex. 3. **Push with Spread Operator (`...`)**: This approach uses the spread operator to pass elements from `params` to the `push()` method of the target array. It's similar to using `concat()`, but avoids creating a new array. * Pros: Efficient (no overhead of creating a new array), concise. * Cons: May not be as readable or intuitive as `concat()`. 4. **Array.prototype.push.apply()**: This method applies an array of arguments to the `push()` method, which can be more efficient than calling `push()` multiple times with individual elements. * Pros: Efficient (no overhead of creating a new array), concise. * Cons: May not be as readable or intuitive as `concat()`. **Library and Special JS Features** None of the test cases use any libraries or special JavaScript features beyond what's built into the browser. The spread operator is a standard feature in modern JavaScript, while `Array.prototype.concat()`, `push()`, and `Array.prototype.push.apply()` are all part of the standard library. **Considerations** When choosing an approach for concatenating arrays, consider the size and complexity of your data, as well as readability and maintainability. For small to medium-sized datasets, any of these approaches should be sufficient. However, for large or complex datasets, you may want to consider using `concat()` with a more modern browser or JavaScript engine that supports its performance improvements. **Alternatives** Other alternatives for concatenating arrays include: * Using the `Set` constructor and then converting it back to an array: `new Set([...params, 1, 2]).values().toArray()` * Using the `reduce()` method: `[...params, ...[1, 2].reduce((a, b) => [...a, b])]` However, these alternatives may not be as efficient or readable as the approaches compared in this benchmark.
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