Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Array.prototype.slice vs spread operator (use results)
(version: 0)
Compare the new ES6 spread operator with the traditional slice() method
Comparing performance of:
Array.prototype.slice vs spread operator
Created:
3 years ago
by:
Guest
Jump to the latest result
Tests:
Array.prototype.slice
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].slice(); console.log(other)
spread operator
var params = [ "hello", true, 7 ] var other = [ ...params ] console.log(other)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
Array.prototype.slice
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):
Let's break down the provided benchmark and explain what's being tested. **Benchmark Overview** The benchmark compares two approaches for creating a new array: `Array.prototype.slice()` and the ES6 spread operator (`...`). The goal is to measure which approach is faster. **Options Compared** There are only two options being compared: 1. **`Array.prototype.slice()`**: This method creates a shallow copy of a portion of an array, returning a new array object with references to the same elements as the original array. 2. **ES6 Spread Operator (`...`)**: This operator allows you to create a new array by spreading out the elements of an existing array. **Pros and Cons** * **`Array.prototype.slice()`**: + Pros: widely supported, easy to use, and well-documented. + Cons: creates a shallow copy of the original array, which can be slower for large datasets. * **ES6 Spread Operator (`...`)**: + Pros: creates a deep copy of the original array (assuming you're using modern JavaScript engines), more concise, and efficient. + Cons: may not work as expected in older browsers or environments that don't support it. **Library Used** None is explicitly mentioned. However, assuming you're running this benchmark on modern browsers that support ES6 features, the spread operator relies on the `Array.prototype.slice()` method under the hood. **Special JS Feature/Syntax** The test case uses a special syntax for the spread operator (`var other = [ ...params ]`). This is a feature introduced in ECMAScript 2015 (ES6) and is supported by modern JavaScript engines. It allows you to create a new array by spreading out the elements of an existing array. **Other Considerations** * The benchmark measures the execution speed of both approaches, which can vary depending on the size of the input array and other factors. * The results are likely biased towards the faster approach, as it's often the case that creating a new array using the spread operator is more efficient than using `Array.prototype.slice()`. **Alternative Approaches** If you're looking for alternative approaches to create a new array, here are a few: 1. **`Array.from()`**: This method creates a new array from an iterable source. 2. **`concat()`**: This method creates a new array by concatenating multiple arrays or iterables. 3. **`slice()`** with `Object.assign()` (not recommended): While not as efficient as the spread operator, you can create a new array using `Array.prototype.slice()` and then use `Object.assign()` to copy the elements. Keep in mind that these alternatives may have different performance characteristics than the spread operator or `Array.prototype.slice()`.
Related benchmarks:
Array.prototype.slice vs spread operator.
Array.prototype.slice vs spread operator With slightly bigger array
Array.prototype.slice vs spread operator on a bigger array
Array.prototype.slice vs spread operator - large array 100000
Array.prototype.slice vs spread operator performance
Comments
Confirm delete:
Do you really want to delete benchmark?