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Array.prototype.concat vs spread operator (for one element)
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator vs Array.prototype.push
Created:
6 years ago
by:
Guest
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Tests:
Array.prototype.concat
var params = 7; var other = [ 1, 2 ].concat(params);
spread operator
var params = [1,2] var other = [ ...params, 7 ]
Array.prototype.push
var params = 7; var other = [1,2].push(params)
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Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
Array.prototype.concat
spread operator
Array.prototype.push
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N/A
Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark and explain what's being tested, compared, and their pros/cons. **Benchmark Overview** The provided benchmark compares three different approaches to create an array with one additional element: 1. Using `Array.prototype.concat()` method 2. Using the spread operator (`...`) 3. Using `Array.prototype.push()` method **Test Case 1: Array.prototype.concat()** This test case uses the traditional `concat()` method to concatenate an existing array `[1, 2]` with a single element `7`. The expected output is a new array `[1, 2, 7]`. **Pros and Cons of concat():** * Pros: + Wide browser support + Easy to understand for developers familiar with the `concat()` method * Cons: + Can be slower compared to other methods due to its inherent overhead (e.g., creating a new array object) + May cause memory allocation issues if not handled carefully **Test Case 2: Spread Operator (`...`)** This test case uses the spread operator to create a new array by spreading the existing array `[1, 2]` and appending `7`. The expected output is a new array `[1, 2, 7]`. **Pros and Cons of Spread Operator:** * Pros: + Faster than `concat()` since it avoids creating a new array object + More concise and expressive for developers familiar with the syntax * Cons: + May require more developer knowledge to understand its behavior + Can be slower in older browsers or those without ES6 support **Test Case 3: Array.prototype.push()** This test case uses the `push()` method to add a single element `7` to the existing array `[1, 2]`. The expected output is a new array with the additional element. **Pros and Cons of push():** * Pros: + Fastest approach among the three, since it only updates the existing array + Wide browser support (since `push()` has been supported since ECMAScript 5) * Cons: + May not be as concise or expressive as other methods for some developers **Library and Special JS Feature** None of these test cases rely on any external libraries, but they do use the spread operator (`...`), which is a new feature introduced in ECMAScript 2018 (ES6). The spread operator allows you to create a new array by spreading existing iterable objects. **Other Alternatives** If you wanted to compare other approaches, you could consider adding test cases for: * Using `Array.prototype.splice()` with `shift` or `unshift` methods * Using `Object.assign()` method (although this might be slower and less concise) * Using a library like Lodash's `concatBy` function Keep in mind that the choice of alternative approaches depends on your specific use case, performance requirements, and target browsers.
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