The solutions presented below cover various comparison scenarios, including array intersections and differences.
If you know that you'll be dealing with large arrays, it may be necessary to fine-tune the solutions to improve performance.
How to check if two arrays are identical?
Here's one way to check if two arrays are identical. This means that both arrays have the same values at the same positions.
In this solution, we created a function to make our comparison code easily reusable.
The first thing we check is if the two arrays have different lengths.
This is a simple and important check because there is no need to iterate over the arrays if we already know they are different.
Then, we use the `every` prototype method to compare each element of the two arrays.
The `every` function performs a test on each element of the array it is used on.
In this case, we use the `index` variable to compare the values of the two arrays.
Comparing arrays with a library like LoDash
If you find yourself writing a lot of functions to work with arrays and objects, you might consider using a library.
LoDash is a great option and has a built-in function to check if two arrays are equal.
After including the LoDash library, you can use the `isEqual` function.
Using JSON.stringify to compare arrays
One very simple way to compare two arrays is to convert them into strings using JSON.stringify, and then compare the two strings.
This solution makes our code very simple but is not particularly performant.
We may also encounter issues when the string representation of certain values does not match, leading to hard-to-debug errors.
How to check if two arrays have the same values?
Here's how to check if two arrays have the same values, but not necessarily in the same order.
Once again, we first check if the two arrays have the same length to save computation time.
Then, we perform a filtering operation, where we use the `includes` prototype to check if the second array has each value at a certain index.
This filtering operation will return an array of matches, so if the length is the same as our input array, we know that our compared arrays contain the same values.
How to find the corresponding values between two arrays (intersection)?
Here's how you can obtain the intersection of arrays. An intersection is simply a comparison of two arrays that returns the values present in both arrays.
How to find the values that are not in both arrays (difference)?
Here's how you can find the difference between two arrays. The difference is the inverse of the intersection. It represents all the values that are not shared between the two arrays.