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Array.prototype.concat vs spread operator (jquery removed)
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
3 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:
<idle, ready to run>
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Test case name
Result
Array.prototype.concat
spread operator
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to help explain the provided JavaScript microbenchmark. **Benchmark Overview** The benchmark compares two approaches for concatenating arrays in JavaScript: 1. `Array.prototype.concat()` 2. The new ES6 spread operator (`...`) **Options Compared** The benchmark tests both options with a specific dataset: an array of three elements, including a string, a boolean, and an integer. **Pros and Cons of Each Approach** * **`Array.prototype.concat()`**: + Pros: widely supported, well-established method. + Cons: can be slower due to the creation of a new array object. * **ES6 Spread Operator (`...`)**: + Pros: modern, efficient, and concise way to concatenate arrays. + Cons: requires JavaScript version support (not available in older browsers). **Library Usage** There is no external library used in this benchmark. **Special JS Feature/Syntax** The spread operator (`...`) was introduced in ES6 and is a relatively new feature in JavaScript. It allows for the creation of new arrays from existing ones by specifying the elements to be included. **Benchmark Preparation Code** Not provided, as it's assumed that the test cases are self-contained and don't require any external setup or dependencies. **Other Alternatives** In addition to `Array.prototype.concat()` and the ES6 spread operator, other methods for concatenating arrays in JavaScript include: * Using the `push()` method: `array.push(...new_array)` * Using the `slice()` method with a negative offset: `array.slice(-new_array.length)` While these alternatives may be available, they are not typically used in production code due to performance considerations. **Benchmark Results** The latest benchmark results show that the ES6 spread operator (`...`) is generally faster than `Array.prototype.concat()`, but this may vary depending on specific use cases and browser versions. The results demonstrate the benefits of using modern JavaScript features for performance-critical code paths.
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