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Array.prototype.concat vs spread operator (fix)
(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
Go to the latest result
Script Preparation code:
var params = [ "hello", true, 7 ];
Tests:
Array.prototype.concat
var other = [ 1, 2 ].concat(params);
spread operator
var other = [ 1, 2, ...params ]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Array.prototype.concat
spread operator
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
11 months ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36
Browser/OS:
Chrome 139 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=616310" width="100%" height="500px"></iframe>
spread operator
85.2M/s
Array.prototype.concat
28.0M/s
View exact numbers
Test name
Executions per second
✓
spread operator
85,154,752 Ops/sec
Array.prototype.concat
27,993,874 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and explain what's being tested. **Benchmark Definition** The benchmark is comparing two approaches to concatenate arrays in JavaScript: `Array.prototype.concat()` method and the new ES6 spread operator (`...`). The script preparation code defines an array `params` with three elements: "hello", `true`, and `7`. **Options Compared** Two options are being compared: 1. **`Array.prototype.concat()`**: This is a traditional method for concatenating arrays, which involves creating a new array object by combining the original array with another array. 2. **Spread Operator (`...`)**: This is a new syntax introduced in ES6 that allows you to create a new array by spreading elements from an existing array. **Pros and Cons** * **`Array.prototype.concat()`**: + Pros: widely supported, easy to understand for those familiar with JavaScript arrays. + Cons: can be slower than the spread operator due to its more complex implementation (creating a new array object). * **Spread Operator (`...`)**: + Pros: generally faster, more concise and readable, especially in modern browsers that support it well. + Cons: less widely supported, may not work as expected in older browsers or environments. **Library** None. This benchmark uses only built-in JavaScript functionality. **Special JS Feature/Syntax** No special features or syntax are used beyond the spread operator. **Other Alternatives** * **Array.prototype.push()**: Another common way to concatenate arrays in JavaScript, which would involve creating an array and then pushing elements onto it. * **Array.concat() with a function**: Creating a function that takes an array as input and returns a new concatenated array.
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