Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Add element at index 0 (Splice vs Spread vs unshift)
(version: 0)
Comparing performance of:
Splice vs Unshift vs Spread
Created:
2 years ago
by:
Guest
Jump to the latest result
Tests:
Splice
const testArray = [1, 2, 3, 4, 5, 6, 7]; testArray.splice(0, 0, 10);
Unshift
const testArray = [1, 2, 3, 4, 5, 6, 7]; testArray.unshift(10);
Spread
let testArray = [1, 2, 3, 4, 5, 6, 7]; testArray = [10, ...testArray];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
Fork
Test case name
Result
Splice
Unshift
Spread
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 JavaScript microbenchmark on MeasureThat.net, which compares the performance of three different approaches to add an element at index 0 in an array: `splice`, `unshift`, and `spread`. **Approaches Compared** 1. **Splice**: This method modifies the original array by removing the first element (at index 0) and then inserting the new element. 2. **Unshift**: This method creates a new array with the new element at the beginning and then assigns it to the original array. 3. **Spread**: This method uses the spread operator (`...`) to create a new array by spreading the existing array and then concatenating the new element. **Pros and Cons of Each Approach** * **Splice**: + Pros: Efficient for large arrays, as it only requires updating the length property of the original array. + Cons: May not be suitable for small arrays or edge cases where modifying the array's internal state can lead to performance issues. * **Unshift**: + Pros: Creates a new array with the desired element at the beginning, which can be useful in certain scenarios. + Cons: Requires creating a new array, which can consume more memory and may have slower execution times compared to `splice`. * **Spread**: + Pros: Creates a new array without modifying the original array's internal state, making it suitable for arrays with many elements or sensitive data. + Cons: May be slower than `splice` due to the creation of a new array. **Library and Special JS Feature** None are explicitly mentioned in this benchmark. However, note that some JavaScript engines may have built-in optimizations or specific implementations for these methods. **Benchmark Preparation Code** The provided JSON defines three individual test cases: 1. **Splice**: Removes the first element (at index 0) from the `testArray` and inserts a new element. 2. **Unshift**: Adds a new element at the beginning of the `testArray`. 3. **Spread**: Creates a new array by spreading the existing `testArray` and then concatenating a new element. **Alternative Approaches** Other approaches to add an element at index 0 in an array might include: * Using `concat()` with an array literal: `[...testArray, 10]` * Using a loop to iterate through the array and push the new element: `for (let i = 0; i < testArray.length; i++) { testArray.push(10); }` * Using a library like Lodash or Ramda for array manipulation Keep in mind that these alternative approaches may have different performance characteristics, memory usage, or syntax requirements compared to the methods tested in this benchmark.
Related benchmarks:
Splice vs Spread to insert at beginning of array
Splice vs Spread vs Unshift to insert at beginning of array
Splice vs Spread vs Unshift to insert at beginning of array (fixed from slice)
Splice vs Spread vs Unshift vs Push to insert at beginning of array
Using Splice vs Spread vs Unshift to insert at beginning of array
Comments
Confirm delete:
Do you really want to delete benchmark?