Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Spread operator vs. slice small
(version: 0)
Creating a "new" array reference every time
Comparing performance of:
Spread operator vs Slice()
Created:
7 years ago
by:
Guest
Jump to the latest result
Tests:
Spread operator
var n = []; while(true) { n.push('asdf'); n = [...n]; if(n.length >= 10000) break; }
Slice()
var n = []; while(true) { n.push('asdf'); n.slice(); if(n.length >= 10000) break; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
Spread operator
Slice()
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 dive into the world of JavaScript microbenchmarks. **Benchmark Definition** The benchmark is designed to compare two approaches: using the spread operator (`[...]`) and using the `slice()` method to create a new array reference. The test case creates an empty array `n` and pushes elements into it in a loop until it reaches 10,000 elements. **Options Compared** Two options are being compared: 1. **Spread Operator**: Using the spread operator (`[...]`) to create a new array reference. 2. **Slice() Method**: Using the `slice()` method to create a new array reference. **Pros and Cons of Each Approach** 1. **Spread Operator**: * Pros: Creates a new array reference with minimal overhead, efficient use of memory, and is often faster than `slice()` because it creates a shallow copy. * Cons: May not work as expected if the original array contains objects or arrays as elements, as it will only create a shallow copy. 2. **Slice() Method**: * Pros: Works with any type of array element (objects and arrays), but may have higher overhead than the spread operator due to creating a deep copy. * Cons: May be slower than the spread operator for large arrays. **Library Usage** There is no library used in this benchmark. It's a simple JavaScript test case that leverages built-in functions (`Array.prototype.push()`, `Array.prototype.slice()`). **Special JS Feature/Syntax** The benchmark uses a feature that is widely supported by modern browsers: the spread operator (`[...]`). It also uses a standard JavaScript function, `while(true)`. No special syntax or features are used. **Other Alternatives** Other approaches could be explored to measure the performance difference between these two options: * Using `Array.prototype.concat()` instead of the spread operator * Using `Array.prototype.push()`, `Array.prototype.unshift()`, and then using `slice()` to get the new array reference * Comparing with other libraries or frameworks that implement array operations differently Keep in mind that performance differences between these approaches may vary depending on the specific use case, browser, and JavaScript engine. If you're interested in exploring other alternatives or optimizing this benchmark for better performance, I can provide more guidance!
Related benchmarks:
Array.prototype.slice vs spread operator with length limit
Array.prototype.slice vs spread operator With slightly bigger array
Array clone from index 1 to end: spread operator vs slice
Array.prototype.slice vs spread operator on a bigger array
Array.prototype.slice vs spread operator - large array 100000
Comments
Confirm delete:
Do you really want to delete benchmark?