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Array.prototype.concat vs spread operator jcc
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator vs jQuery merge
Created:
6 years ago
by:
Guest
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HTML Preparation code:
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>
Tests:
Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [...params ]
jQuery merge
var params = [ "hello", true, 7 ]; var other = $.merge([], params);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Array.prototype.concat
spread operator
jQuery merge
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. **Benchmark Overview** The provided benchmark compares three approaches to concatenate arrays in JavaScript: 1. `Array.prototype.concat()` 2. The spread operator (`...`) 3. jQuery's `.merge()` method **Options Compared** Each test case measures the execution time of one specific approach, allowing users to compare their performance across different methods. * **Pros and Cons:** + `Array.prototype.concat()`: A traditional method that creates a new array by concatenating the original array with another array. This approach can be slower due to the overhead of creating a new array. + Spread operator (`...`): A modern method that uses the syntax `[...array]` to create a new array from an existing one. This approach is generally faster than `concat()` because it avoids the overhead of creating a new array. + jQuery's `.merge()` method: A utility method provided by jQuery that merges two arrays into a new array. This approach can be slower than the spread operator due to the added complexity of working with jQuery's internal implementation. * **Other Considerations:** + The benchmark uses a variety of browsers (Chrome 80) and devices (Desktop, Windows) to ensure a representative sample size. + The use of a fixed array length (`params`) ensures that the results are not affected by varying input sizes. **Library Usage** None of the tested approaches rely on any external libraries beyond jQuery's `.merge()` method. However, it's worth noting that modern JavaScript implementations, such as V8 (used in Chrome), have optimized arrays and concatenation methods, making these tests more relevant to real-world performance. **Special JS Features or Syntax** The benchmark uses the spread operator (`...`), which was introduced in ECMAScript 2015. This syntax allows for concise array creation and is widely supported across modern JavaScript engines. The use of this feature makes the test more relevant to recent JavaScript development. **Alternatives** If you're interested in exploring alternative approaches, consider the following methods: * `Array.prototype.push()`: Concatenating arrays using `push()` can be slower than the spread operator or `concat()`. * `String concatenation**: Concatenating strings using the `+` operator can be slower than using array methods. * Custom implementations: Depending on your specific requirements, you might need to implement a custom concatenation method. This approach requires careful consideration of performance and optimization. By understanding these approaches and their trade-offs, developers can make informed decisions when choosing the best method for their use case.
Related benchmarks:
Array.prototype.concat vs spread operator sans jquery
Array.prototype.concat vs spread operator (withouth JQuery)
Array.prototype.concat vs spread operator (without any jQuery)
Array.prototype.concat vs spread operator (fix)
Array.prototype.concat vs spread operator (w/out jQuery)
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