var array = Array.from({length:500},(v,k)=>k+1);
var i = 250;
array.slice(0, i).concat(array.slice(i + 1));
Array.from(array).splice(i,1);
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
slice | |
splice |
Test name | Executions per second |
---|---|
slice | 1256823.0 Ops/sec |
splice | 1063505.0 Ops/sec |
Let's break down the provided JSON benchmark definition and explain what is being tested.
Overview
The benchmark tests two approaches to remove an element from an array: using Array.prototype.slice()
or Array.prototype.splice()
. The goal is to determine which approach is faster and more efficient in JavaScript.
Options compared
array.slice(0, i).concat(array.slice(i + 1))
: This approach creates a new array by taking two slices of the original array (slice(0, i)
and slice(i + 1)
) and concatenating them together.Array.from(array).splice(i,1)
: This approach uses the Array.from()
method to create a new array from the original array, and then calls splice()
on this new array to remove the element at index i
.Pros and Cons
slice()
approach:splice()
approach:Library usage
In this benchmark, Array.from()
is used to create a new array from the original array. This method was introduced in ECMAScript 2015 and allows creating an array from an iterable (like another array). The purpose of using Array.from()
here is to demonstrate how it can be used to create a new array, but since we're measuring performance, its usage is likely more about readability than actual performance impact.
Special JavaScript features There are no special JavaScript features or syntaxes being tested in this benchmark. It's purely focused on comparing the performance of two different approaches to remove an element from an array.
Other alternatives If you wanted to test alternative approaches for removing elements from an array, some possibilities could be:
Array.prototype.filter()
and returning only the elements before and after the index to be removed.Keep in mind that these alternatives might not necessarily provide better performance than the slice()
or splice()
approaches, but they could offer different trade-offs in terms of readability, maintainability, or other factors.