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slice vs splice - Remove items from the beginning of an array
(version: 0)
Comparing performance of:
slice vs splice
Created:
4 years ago
by:
Guest
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Tests:
slice
let data = [...new Array(10000)].map((a,i) => i); for (let i = 0; i < 10000; i++) { let arr = [...data]; arr = arr.slice(-5000); }
splice
let data = [...new Array(10000)].map((a,i) => i); for (let i = 0; i < 10000; i++) { let arr = [...data]; arr.splice(0, arr.length - 5000); }
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Suite status:
<idle, ready to run>
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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 benchmark is to compare two approaches for removing items from the beginning of an array: `slice` and `splice`. The benchmark definition is a JavaScript script that creates an array, removes 5000 elements from the beginning using either `slice` or `splice`, and repeats this process 10,000 times. **Options Compared** Two options are compared: 1. **`slice`**: This method returns a shallow copy of a portion of an array. 2. **`splice`**: This method removes elements from an array and returns the removed elements as an array. **Pros and Cons** * `Slice`: * Pros: * Efficient for small arrays (since it creates a new array) * Creates a shallow copy, which can be beneficial for objects * Cons: * May not be efficient for large arrays due to the overhead of creating a new array * `Splice`: * Pros: * More efficient for large arrays since it modifies the original array in place * Returns the removed elements, which can be useful for certain use cases * Cons: * Creates a shallow copy of the array (due to the modified state) * May not be suitable for use with objects **Library Usage** In both benchmark definitions, no external libraries are used. The `Array.prototype.slice` and `Array.prototype.splice` methods are part of the standard JavaScript API. **Special JS Features/Syntax** There's no special JavaScript feature or syntax being tested in these benchmarks. They only utilize standard JavaScript constructs. **Other Alternatives** If you need to remove elements from an array, there are a few alternative approaches: * `Array.prototype.shift()`: Removes and returns the first element of an array. * `Array.prototype.pop()`: Removes and returns the last element of an array. * Using `filter()` with `Array.prototype.slice()`: Creates a new array containing only elements for which the provided function returns `true`. Keep in mind that each approach has its pros and cons, depending on your specific use case. The benchmarks provided on MeasureThat.net are great examples of how to compare performance between different JavaScript methods. By examining these results, you can gain insights into the most efficient way to remove elements from an array in a given scenario.
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