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Array.concat vs Spread Operator
(version: 0)
Compare the new ES6 spread operator with the standard concat() method
Comparing performance of:
Spread operator vs Concat
Created:
7 years ago
by:
Guest
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Tests:
Spread operator
const a = [ "Hello", true, 10 ], b = [ "World", false, 4 ]; let c = [ ...a, ...b ];
Concat
const a = [ "Hello", true, 10 ], b = [ "World", false, 4 ]; let c = a.concat(b);
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Spread operator
Concat
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 data and explain what's being tested. **What is being tested?** The benchmark compares two approaches to concatenate arrays in JavaScript: 1. The new ES6 spread operator (`...`) 2. The standard `concat()` method The test case provides a simple example where two arrays, `a` and `b`, are created with some initial values. Then, either the spread operator or the `concat()` method is used to create a new array `c` that includes all elements from both `a` and `b`. **Options being compared:** * Spread operator (`...`) * Concat() method **Pros and Cons of each approach:** 1. **Spread Operator (`...`)** * Pros: + More concise and expressive + Can be used with arrays, objects, and even strings + Faster execution (according to the benchmark results) * Cons: + Only works with ES6+ browsers (and some older versions of Node.js) + May not be compatible with all JavaScript environments 2. **Concat() method** * Pros: + More widely supported across different JavaScript environments + Can be used in older browsers and Node.js versions that don't support the spread operator * Cons: + Less concise and less expressive than the spread operator + Generally slower execution compared to the spread operator (according to the benchmark results) **Library/Functionality:** There is no library or functionality being tested in this benchmark. The focus is solely on comparing two built-in JavaScript features. **Special JS feature/Syntax:** The benchmark utilizes the new ES6 spread operator (`...`), which is a syntax feature introduced in ECMAScript 2015 (ES6). It allows for more concise and expressive way of creating arrays by "spreading" elements from one array to another. **Other alternatives:** If you want to concatenate arrays using other methods, some alternatives include: * Using `Array.prototype.push()` method to add elements to an existing array * Creating a new array using the `Array` constructor and then pushing individual elements onto it However, these approaches are generally less concise and expressive than using the spread operator or the `concat()` method. I hope this explanation helps you understand the benchmark!
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