<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
window.arr1 = [1, 2, 3, 4, 5, 6, 7, 8, 9]
window.arr2 = [9, 8, 7, 6, 5, 4, 3, 2, 1]
_.isEqual(window.arr1, window.arr2)
_.xor(window.arr1, window.arr2).length === 0
_.isEqual(_.sortBy(window.arr1), _.sortBy(window.arr2))
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
isEqual | |
xor | |
isEqual sort |
Test name | Executions per second |
---|---|
isEqual | 3209984.5 Ops/sec |
xor | 2237821.2 Ops/sec |
isEqual sort | 755141.7 Ops/sec |
Let's break down the provided benchmark and explain what is being tested, compared, and some pros and cons of each approach.
Benchmark Overview
The provided JSON represents a JavaScript microbenchmark that tests three different approaches for comparing arrays: isEqual
, xor
, and isEqual sort
. The test uses the Lodash library to sort and compare arrays.
Script Preparation Code
window.arr1 = [1, 2, 3, 4, 5, 6, 7, 8, 9];
window.arr2 = [9, 8, 7, 6, 5, 4, 3, 2, 1];
This code creates two arrays in the global scope and assigns them to window.arr1
and window.arr2
, respectively.
Html Preparation Code
<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
This line includes the Lodash library from a CDN, which provides utility functions for array manipulation, including sorting (_.sortBy
).
Benchmark Definitions
The JSON contains three benchmark definitions:
isEqual
: Tests if two arrays are equal using the window.arr1
and window.arr2
.xor
: Tests if the XOR of two arrays is zero (i.e., all elements are equal). This approach uses the _.xor
function from Lodash.isEqual sort
: Tests if two sorted arrays are equal. This approach sorts both arrays using _sortBy
and then compares them.Comparison
The test compares the performance of these three approaches:
isEqual
: Directly comparing the two original arrays.xor
: Using XOR to compare the arrays, which is an alternative way of checking for equality.isEqual sort
: Sorting both arrays before comparison, which can be useful if the order of elements matters.Pros and Cons
Here are some pros and cons of each approach:
Library: Lodash
Lodash is a popular JavaScript library that provides utility functions for array manipulation, including _.sortBy
, used in the isEqual sort
benchmark. It also includes other useful functions like _.xor
.
Special JS Feature/Syntax
There doesn't seem to be any special JavaScript features or syntax used in this benchmark. The test focuses on comparing arrays using different approaches.
Other Alternatives
If you're interested in exploring alternative approaches for array comparison, here are a few options:
Array.prototype.every()
: Instead of XOR, you could use the every()
method to check if all elements in one array match the corresponding elements in another.sort()
and reduce()
methods.Keep in mind that these alternatives may have their own trade-offs in terms of performance, simplicity, or compatibility with different browsers and environments.