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Array.prototype.concat vs spread operator
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Lodash concat vs spread operator vs jQuery merge
Created:
7 years ago
by:
Guest
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HTML Preparation code:
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
Tests:
Lodash concat
var params = [ "hello", true, 7 ]; var other = _.concat([1, 2], params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
jQuery merge
var params = [ "hello", true, 7 ]; var other = $.merge([1, 2], params);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Lodash 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 break down the provided JSON and explain what's being tested. **Benchmark Definition** The benchmark compares two approaches for concatenating arrays: the traditional `concat()` method, the new ES6 spread operator (`...`), and jQuery's `merge()` function. The goal is to determine which approach is faster. **Options Compared** 1. **Lodash `concat()`:** A popular utility library that provides a flexible way to concatenate arrays. 2. **ES6 Spread Operator (`...`):** A new syntax introduced in ECMAScript 2015, allowing for concise array creation and expansion. 3. **jQuery's `merge()` function:** Part of the jQuery library, this function combines multiple arrays into one. **Pros and Cons** 1. **Lodash `concat()`:** * Pros: Well-established, widely used, and well-tested. * Cons: Adds overhead due to the use of a utility library. 2. **ES6 Spread Operator (`...`):** * Pros: Concise, efficient, and easy to read. * Cons: Requires ECMAScript 2015 support, which might not be available in older browsers or environments. 3. **jQuery's `merge()` function:** * Pros: Convenient for jQuery developers who already rely on the library. * Cons: Adds overhead due to the use of a larger library. **Library and Purpose** 1. **Lodash:** A JavaScript utility library providing functional programming tools, including array manipulation functions like `concat()`. 2. **jQuery's `merge()` function:** Part of the jQuery library, this function combines multiple arrays into one, often used for DOM manipulation and event handling. **Special JS Feature or Syntax** The benchmark uses the ES6 spread operator (`...`), which is a relatively new feature introduced in ECMAScript 2015. This syntax allows for concise array creation and expansion, making it easier to write code that creates arrays with merged data. **Alternative Approaches** Other approaches for concatenating arrays might include: 1. **Using `Array.prototype.push()`:** Iteratively adding elements to an array using the `push()` method. 2. **Using a custom implementation:** Writing a custom function for concatenating arrays, potentially optimized for performance. 3. **Using other libraries or frameworks:** Some libraries or frameworks might provide their own solutions for array concatenation, such as React's `concat` function. These alternatives are not explicitly tested in the provided benchmark, but they could be explored to determine which approach is fastest and most efficient.
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