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spread vs. concat
(version: 0)
Comparing performance of:
concat vs spread
Created:
5 years ago
by:
Guest
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Tests:
concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
concat
spread
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 world of JavaScript microbenchmarks on MeasureThat.net. The benchmark being tested is whether using the spread operator (`...`) or the `concat()` method to concatenate arrays affects performance. **Options Compared:** 1. **Spread Operator (`...`)**: This syntax was introduced in ECMAScript 2015 (ES6) as a way to expand an array into individual elements. 2. **Concatenation using `concat()`**: The `concat()` method takes one or more arrays as arguments and returns a new array containing all the elements from the input arrays. **Pros and Cons:** 1. **Spread Operator (`...`)**: * Pros: More concise, easier to read, and can be used with multiple arrays. * Cons: Might incur additional overhead due to the creation of intermediate arrays or stack allocation for large arrays. 2. **Concatenation using `concat()`**: * Pros: More explicit, well-established, and widely supported in older browsers and JavaScript engines. * Cons: Can be less concise and more error-prone compared to the spread operator. **Library and Special Features:** None of these options rely on any external libraries. The spread operator is a native feature introduced by ECMAScript 2015 (ES6). **No special JavaScript features or syntax are used in this benchmark.** **Other Alternatives:** If you're interested in exploring other approaches, here are some alternatives: * Using `Array.prototype.push()` instead of concatenation * Using `Array.prototype.reduce()` to concatenate arrays * Using `Object.assign()` with an array as the target object Keep in mind that these alternatives might not provide significant performance benefits and may introduce additional overhead or complexity. **Benchmark Preparation Code:** The provided script preparation code is empty, which means that MeasureThat.net likely generates this code automatically for each test case. The HTML preparation code is also empty, indicating that no specific HTML elements need to be customized for these tests. In summary, the benchmark compares the performance of two ways to concatenate arrays in JavaScript: using the spread operator (`...`) versus concatenation using `concat()`. The results indicate that the spread operator might have a slight performance advantage on this particular test.
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