Ruby Array Comparison Tricks

Do you ever find yourself programming in ruby, and you have two arrays, and you want to compare them against each other? Here's a couple of helpful array operators you can use that will show you which elements are common to two arrays, which are different, and more:

1. array1 = ["x", "y", "z"]  
2. array2 = ["w", "x", "y"]  
3.   
4. array1 | array2 # Combine Arrays & Remove Duplicates(Union)  
5. => ["x", "y", "z", "w"]  
6.   
7. array1 & array2  # Get Common Elements between Two Arrays(Intersection)  
8. => ["x", "y"]  
9.   
10. array1 - array2  # Remove Any Elements from Array 1 that are contained in Array 2.(Difference)  
11. => ["z"]