

The **`&`** operator, also known as the **ampersand** operator, is used on two arrays to determine the unique elements between the two. You can use the `&` operator when you want to get the set intersection. The `&` operator returns an array that contains elements that are unique and present in both arrays.

#     
#  Syntax
```ruby
array & other_array
``` 

#     
## Parameters
The `&` operator does not accept any parameters.

##    
## Return value
The return value is a new array that contains elements that are present and unique in both arrays. 

## Example
In the example below, we create several arrays and use the `&` operator to return new arrays with unique and similar elements.

# create arrays
arr1 = [1, 2, 3, 4, 5]
arr2 = [2, 1, 6, 7, 5]

arr3 = ["a", "b", "c", "d", "e"]
arr4 = ["z", "c", "d", "x"]

arr5 = ["Ruby", "Java", "JavaScript", "Python"]
arr6 = ["C", "Java", "Python"]

arr7 = ["1ab", "2cd", "3ef", "4gh", "5ij"]
arr8 = ["5ij", "6kl", "3ef", "3ef"]

arr9 = [nil, "nil", "true", "false", true]
arr10 = [false, false]

puts "#{arr1 & arr2}"   # [1, 2, 5]
puts "#{arr3 & arr4}"   # ["c", "d"]
puts "#{arr5 & arr6}"   # ["Java", "Python"]
puts "#{arr7 & arr8}"   # ["3ef", "5ij"]
puts "#{arr9 & arr10}"  # []

How to use the ampersand (&) operator on two arrays in Ruby

The & operator in Ruby returns an array of unique elements present in both arrays.