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Array concat vs spread operator vs push single element on a 40 elems array
(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:
6 years ago
by:
Guest
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Script Preparation code:
var params = [...Array(40).keys()]
Tests:
Array.prototype.concat
var other = params.concat([ 1 ]);
spread operator
var other = [ ...params, 1 ]
Push
var other = params.push(1);
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
Push
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 benchmark and its various components. **Benchmark Definition** The benchmark is comparing three different methods to concatenate or modify an array: 1. `Array.prototype.concat()` 2. The new ES6 spread operator (`[ ...params, 1 ]`) 3. Using the `push()` method on a single element (`params.push(1)`) These methods are being compared for their performance in modifying an array with 40 elements. **Options Compared** The benchmark is comparing three different approaches: * `Array.prototype.concat()`: This method creates a new array and returns it, which can be slower than other methods. * The spread operator (`[ ...params, 1 ]`): This method creates a new array by spreading the existing array (`params`) and then concatenating the new element (1). * Using the `push()` method on a single element (`params.push(1)`): This method modifies the original array in-place. **Pros and Cons of Each Approach** * `Array.prototype.concat()`: + Pros: Can be faster for large arrays, as it avoids creating a new array. + Cons: Creates a new array, which can lead to memory allocation overhead. * Spread operator (`[ ...params, 1 ]`): + Pros: Efficiently creates a new array without modifying the original one. + Cons: Can be slower for very large arrays due to the spread operation. * Using `push()` method on a single element: + Pros: Modifies the original array in-place, which can be faster. + Cons: Creates an intermediate element object, which can lead to performance issues. **Library Used** None explicitly mentioned. However, it's likely that the benchmark uses built-in JavaScript functionality for these operations. **Special JS Feature or Syntax** The spread operator (`[ ...params, 1 ]`) is a new feature introduced in ECMAScript 2015 (ES6). It allows creating a new array by spreading an existing array and then concatenating new elements. **Other Considerations** * The benchmark only measures the performance of these three methods on a specific use case. Other factors like memory allocation, garbage collection, or caching might affect performance in other scenarios. * The benchmark results are likely to be influenced by the JavaScript engine's optimizations, browser-specific behavior, and hardware characteristics. **Alternatives** Other alternatives for concatenating or modifying arrays include: * `Array.prototype.splice()`: Modifies the original array in-place by replacing a range of elements with new elements. * `Array.prototype.slice()`: Creates a shallow copy of a portion of an array and returns it. * `Array.prototype.map()`, `Array.prototype.filter()`, etc.: These methods can be used to create a new array, but they might not offer the same performance as concatenation or in-place modifications. In conclusion, this benchmark provides valuable insights into the performance differences between various methods for modifying arrays. Understanding these differences is essential for optimizing code and making informed decisions about which approach to use in different situations.
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