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Array.prototype.concat vs spread operator (without any jQuery)
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
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 ]
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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):
Let's break down the provided benchmark and its components. **Benchmark Overview** The provided JSON represents a JavaScript microbenchmark test created on MeasureThat.net. The goal of this test is to compare the performance of two different methods for concatenating arrays: `Array.prototype.concat()` and the spread operator (`...`). **Options Compared** There are two options being compared: 1. **`Array.prototype.concat()`**: This method uses the traditional approach to concatenate arrays by creating a new array with the elements from both input arrays. 2. **Spread Operator (`...`)**: This is a new ES6 feature that allows for more concise and expressive array concatenation. **Pros and Cons of Each Approach** * **`Array.prototype.concat()`**: + Pros: More control over the resulting array, as each element can be individually processed before adding it to the concatenated array. + Cons: Can be slower due to the need to create a new array object and iterate through its elements. * **Spread Operator (`...`)**: + Pros: More concise and readable syntax, as it allows for direct spreading of elements into a new array. + Cons: May incur additional overhead due to the creation of a temporary array object during execution. **Library Usage** There is no library being used in this benchmark. Both options are native JavaScript constructs. **Special JS Features or Syntax** The spread operator (`...`) is a special feature introduced in ECMAScript 2015 (ES6). It allows for more expressive and concise syntax when working with arrays, objects, and other iterable types. **Other Considerations** When choosing between these two approaches, consider the following factors: * **Performance**: If you need to concatenate large arrays frequently, the `Array.prototype.concat()` method might be slightly slower due to its additional overhead. However, the difference is usually negligible for most use cases. * **Code Readability and Maintainability**: The spread operator (`...`) can make your code more concise and readable, especially when working with large datasets or complex logic. **Alternatives** Other alternatives for array concatenation include: * Using `Array.prototype.push()` to add elements one by one: `var arr = [1, 2]; arr.push(3);` * Using `Array.concat()` from the `Array` prototype (not recommended as it's slower than `concat()`: `var arr = new Array([1, 2]); arr = arr.concat([3])`) * Using `Array.prototype.splice()` to merge arrays: `var arr1 = [1, 2]; var arr2 = [3, 4]; arr1.splice(0, arr1.length, ...arr2)` These alternatives might be useful in specific situations or when working with older browsers that don't support the spread operator.
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