When dealing with Arrays in Ruby we frequently come across cases, where we want to find the intersection of arrays.

Our previous blog post, refers to Array#intersection method, which was used to return the common elements between arrays as shown below:

But in few cases, we only want to check if arrays intersect without knowing the result.

#### Before

Before Ruby 3.1, we would chain the intersection method with #any? or #empty? to check if the result is true or false.

The above approach will first compute the intersection array and then evaluate #any? or #empty? on the result.

#### After

To save memory and improve performance, Ruby 3.1 added Array#intersect? method which returns true if two arrays have at least one element in common, otherwise returns false.

Note

Unlike #intersection method which accepts multiple arrays as argument we cannot pass multiple arrays to #intersect method.