Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Array.prototype.concat vs spread operator vs push apply
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator vs jQuery merge
Created:
7 years ago
by:
Guest
Jump to the latest result
Tests:
Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
jQuery merge
var params = [ "hello", true, 7 ]; var other = [1,2].push.apply([1,2], params);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
Fork
Test case name
Result
Array.prototype.concat
spread operator
jQuery merge
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):
Let's break down the provided benchmark and explain what's being tested, along with the pros and cons of each approach. **Benchmark Overview** The benchmark compares three ways to concatenate or merge arrays in JavaScript: 1. `Array.prototype.concat()` 2. The new ES6 spread operator (`...`) 3. The `push.apply()` method (not a native JavaScript method, but rather a variant used by jQuery) **What's being tested?** For each test case, the benchmark is measuring the performance of each approach on a specific input: * `var params = [ "hello", true, 7 ];` and `var other = [ 1, 2 ].concat(params);` + Tests: `Array.prototype.concat()`, spread operator (`...`) * `var params = [ "hello", true, 7 ]` and `var other = [ 1, 2, ...params ]` + Tests: Spread operator (`...`) * `var params = [ "hello", true, 7 ];` and `var other = [1,2].push.apply([1,2], params);` + Tests: `jQuery merge` (Note: This is not a native JavaScript method. jQuery uses it to merge arrays.) **Approach pros and cons** ### Array.prototype.concat() * Pros: + Well-established and widely supported in modern browsers. + Easy to understand and implement. * Cons: + May create unnecessary intermediate objects, leading to increased memory usage. ### Spread Operator (`...`) * Pros: + Efficient and concise way to merge arrays. + Creates a new array without modifying the original one. * Cons: + Requires ES6 support (not available in older browsers). + Can lead to unexpected behavior if not used carefully. ### jQuery merge (push.apply()) * Pros: + Convenient and easy to use, as it's a variant of the native `push()` method. * Cons: + Not a native JavaScript method, which can make code harder to understand and debug. + May not be supported by all browsers or environments. **Library/Feature explanations** The spread operator (`...`) is a new feature introduced in ES6, allowing for more concise array merging. It's now widely supported in modern browsers. No special JavaScript features or syntax are mentioned in this benchmark. **Alternatives** Other alternatives to the above methods include: * `Array.prototype.push()` followed by `concat()`: This approach would involve pushing elements from one array into another and then concatenating the two arrays. * Using a library like Lodash or Ramda, which provide optimized functions for merging arrays. * Using a native method like `set` on a Map or Set object to merge arrays. Keep in mind that each of these alternatives may have their own trade-offs and performance characteristics.
Related benchmarks:
concat 2 arrays: Array.prototype.concat vs spread operator
Array.prototype.concat vs spread operator (fix)
Array.prototype.concat vs spread operator real
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?