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Array concat vs spread operator vs push v23
(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
Created:
4 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);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
Array.prototype.concat
spread operator
Push
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** The provided JSON represents a JavaScript microbenchmark on MeasureThat.net, which compares the performance of three approaches for concatenating arrays: the traditional `concat()` method, the ES6 spread operator (`...`), and the `push()` method. **Comparison Options** The benchmark tests the following options: 1. **Array.prototype.concat**: The traditional way to concatenate arrays in JavaScript. 2. **Spread Operator (ES6)**: A new feature introduced in ES6 that allows using the `...` syntax to create a new array by spreading an existing array or other iterable. 3. **Push**: Using the `push()` method to add elements to an array and then concatenating it with another array. **Pros and Cons of Each Approach** 1. **Array.prototype.concat**: * Pros: Well-established, widely supported, and easy to use. * Cons: Can be slower than other approaches due to the overhead of creating a new array and copying elements from the original arrays. 2. **Spread Operator (ES6)**: * Pros: More concise and readable than traditional concatenation methods, can reduce memory allocation and copying issues. * Cons: Introduced relatively recently, may not be supported in older browsers or versions of JavaScript. 3. **Push**: * Pros: Can be faster than `concat()` since it only adds elements to the existing array without creating a new one, reducing memory allocations. * Cons: Requires more manual memory management and can lead to performance issues if not used carefully. **Library Usage** There is no explicit library usage in this benchmark. However, it's worth noting that MeasureThat.net might use some underlying libraries or frameworks for its testing infrastructure, but they are not explicitly mentioned in the provided JSON. **Special JS Features/Syntax** The ES6 spread operator (`...`) is a special JavaScript feature introduced in ECMAScript 2015 (ES6). It allows using the `...` syntax to create a new array by spreading an existing array or other iterable. **Alternative Approaches** Other alternatives for concatenating arrays include: 1. **Array.prototype.slice()**: Creates a shallow copy of a portion of an array. 2. **Array.prototype.splice()**: Modifies the contents of an array by replacing a specified range of elements with new values, which can be used to concatenate arrays. 3. **Array.from()**: Creates a new array from an iterable or array-like object. Keep in mind that these alternatives might have different performance characteristics and use cases compared to the approaches tested in this benchmark.
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