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splice vs slice split into two
(version: 0)
Comparing performance of:
slice vs splice
Created:
3 years ago
by:
Guest
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Script Preparation code:
var arr = [...Array(1000)].map((_, index) => `item-${index}`); var SPLIT_LENGTH = 555;
Tests:
slice
var a = arr.slice(0, SPLIT_LENGTH); var b = arr.slice(SPLIT_LENGTH); console.log(a.length, b.length);
splice
var a = [...arr]; var b = a.splice(SPLIT_LENGTH, a.length - SPLIT_LENGTH); console.log(a.length, b.length);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
slice
splice
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **Benchmark Definition** The provided JSON represents a benchmark definition for measuring the performance difference between two approaches: `slice` and `splice`. The script preparation code creates an array `arr` with 1000 elements, each labeled as "item-<index>". The `SPLIT_LENGTH` variable is set to 555. **Options Compared** The benchmark compares the performance of two options: 1. **Slice**: Using the `slice()` method to split the array into two parts. 2. **Splice**: Using the `splice()` method to remove elements from the end of the array and create a new array. **Pros and Cons** * **Slice**: + Pros: Efficient, in-place operation with a fixed number of elements removed. It doesn't modify the original array. + Cons: May not be suitable for arrays with large numbers of elements or when exact indices are required. * **Splice**: + Pros: Allows for flexible removal of any number of elements, including non-contiguous ranges. Can be useful in certain scenarios where `slice()` doesn't fit. + Cons: Can be slower than `slice()` due to the overhead of removing elements and creating a new array. **Library Usage** The benchmark uses no external libraries beyond the built-in JavaScript functions `Array.prototype.slice()` and `Array.prototype.splice()`. No third-party libraries are required for this test. **Special JS Feature or Syntax (Not Applicable)** No special JavaScript features or syntax is used in this benchmark. It's focused on demonstrating a straightforward performance comparison between two built-in array methods. **Other Alternatives** If you were to write this benchmark manually, you might consider other approaches: * **Filter**: Using `Array.prototype.filter()` to create a new array with elements above the split point. * **Reduce**: Using `Array.prototype.reduce()` to iterate over the array and accumulate results in two separate arrays. However, these alternatives would likely have different performance characteristics compared to the original `slice` and `splice` approaches. **Benchmark Preparation Code** The provided script preparation code creates an array with 1000 elements using `Array.from()` (not explicitly mentioned, but assumed since it's not part of the benchmark definition) and then sets a variable for the split length. The HTML preparation code is empty. Note that MeasureThat.net likely uses some kind of automation tool or script to generate this initial code snippet, allowing users to focus on testing different JavaScript implementations without worrying about setting up the environment themselves.
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