Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Array.prototype.concat vs spread operator big arrays
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method on big arrays of 2M items
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
5 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var testArr = []; for (let i = 0; i < 2000000; i++) { testArr.push('coucou'); }
Tests:
Array.prototype.concat
var other = [ 1, 2 ].concat(testArr);
spread operator
var other = [ 1, 2, ...testArr ]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
Array.prototype.concat
spread operator
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** The provided JSON represents a benchmark test comparing the performance of two methods: `Array.prototype.concat` and the spread operator (`...`) on large arrays. **Methods Being Compared** 1. **`Array.prototype.concat`**: This is a traditional method for concatenating arrays in JavaScript. It creates a new array by copying all elements from both input arrays. 2. **Spread Operator (`...`)**: Introduced in ES6, the spread operator allows you to copy the contents of an array into another array. **Options Being Compared** The benchmark test measures the performance difference between these two methods on large arrays of 2 million items. **Pros and Cons of Each Approach** 1. **`Array.prototype.concat`**: * Pros: Widely supported, easy to use, and well-documented. * Cons: Creates a new array, which can lead to higher memory usage and slower performance for very large datasets. 2. **Spread Operator (`...`)**: * Pros: More concise and expressive, as it avoids creating a new array by copying elements directly into the target array. * Cons: Requires modern JavaScript versions (ES6+) to be supported, and may not work in older browsers or environments. **Library and Special JS Features** There are no libraries explicitly mentioned in this benchmark. However, the spread operator is a part of the ECMAScript standard, which means it's a built-in feature of the JavaScript language itself. **Test Case Interpretation** The first test case, "Array.prototype.concat", creates a new array `testArr` by pushing 2 million elements and then concatenating it with another array `[1, 2]`. The second test case uses the spread operator to create a new array by copying all elements from `testArr` directly into the target array. **Other Alternatives** If you were to use an alternative method for concatenating arrays, some common options include: * Using the `Array.prototype.push()` method with two separate calls: `array1.push(...array2)` * Creating a new array and pushing all elements from both input arrays using `new Array(0).push(...array1, ...array2)` However, these alternatives might have slightly different performance characteristics or trade-offs compared to the spread operator. In summary, this benchmark test compares the performance of two methods: `Array.prototype.concat` and the spread operator (`...`) on large arrays. The spread operator offers a concise way to create new arrays, but it requires modern JavaScript versions to be supported.
Related benchmarks:
Array.prototype.concat vs Spread operator
concat 2 arrays: Array.prototype.concat vs spread operator
Array.prototype.concat vs spread operator on large array
Array.prototype.concat vs spread operator on small array
Comments
Confirm delete:
Do you really want to delete benchmark?