Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
spread vs concat first vs unshift
(version: 0)
spread vs concat vs unshift
Comparing performance of:
arrayUnshift123 vs arrayConcat123 vs arraySpread123
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var array = [1,2,3];
Tests:
arrayUnshift123
array.unshift(0);
arrayConcat123
array = [0].concat(array)
arraySpread123
array = [0, ...array]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
Fork
Test case name
Result
arrayUnshift123
arrayConcat123
arraySpread123
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 benchmark and explain what's being tested. The provided JSON represents a JavaScript microbenchmark on MeasureThat.net. The benchmark is designed to compare the performance of three different methods for adding an element to the end of an array: `unshift`, `concat`, and spread syntax (`...`). **Options Compared** 1. **Array Unshift**: This method adds an element to the beginning of the array. In this case, it's being tested with a single value (0). 2. **Array Concat**: This method creates a new array by concatenating the original array with another array containing the desired element. 3. **Spread Syntax (`...`)**: This method uses the spread operator to create a copy of the original array and adds the desired element. **Pros and Cons of Each Approach** 1. **Array Unshift**: * Pros: Can be faster than concat when adding multiple elements, as it only requires updating the beginning of the array. * Cons: Slower than concat for single-element additions due to its O(n) time complexity (where n is the length of the original array). 2. **Array Concat**: * Pros: Faster than unshift for single-element additions, with an O(1) time complexity. * Cons: Creates a new array, which can be memory-intensive and slower than modifying the existing array. 3. **Spread Syntax (`...`)**: * Pros: Fastest and most efficient method, as it only requires creating a copy of the original array and adding the element. * Cons: Requires modern browsers that support the spread operator. **Library Used** None are explicitly mentioned in this benchmark definition. **Special JS Features or Syntax** The spread syntax (`...`) is used to create a new array with the desired elements. This feature was introduced in ECMAScript 2015 (ES6) and has since become widely supported across modern browsers. **Other Considerations** * The benchmark only tests single-element additions, which might not reflect real-world scenarios where arrays are frequently modified. * The `concat` method creates a new array, while the other two methods modify the original array. This could lead to different performance characteristics depending on the specific use case. **Alternatives** Other alternatives for adding elements to an array include: 1. `push`: Adds an element to the end of the array. 2. `splice`: Modifies the array by removing or replacing elements at a specified index. 3. Using libraries like Lodash, which provides utility functions for working with arrays. Keep in mind that these alternatives might have different performance characteristics and use cases compared to the three methods being tested in this benchmark.
Related benchmarks:
concat vs unshift vs spread
unshift vs spread vs concat
spread vs concat vs unshift22
Array.prototype.concat vs spread operator (new try)
spread vs concat vs unshift1
Comments
Confirm delete:
Do you really want to delete benchmark?