Ruby's Abbreviated Assignment Operators

Today I Learned ruby has a lot of abbreviated assignment operators.

The best known are += and -= to increment and decrement values:

x = 2
x += 1
x #=> 3

And of course there's ||=, to assign only if the value is nil or false:

x = nil
x ||= 4 #=> 4
x ||= 5 #=> 4

But these abbreviations can be applied to a lot more operators!

It works with all of the following: +, -, *, /, %, **, &, |, ^, <<, >>, &&, ||.

So we could use |= to union two arrays and assign the result to the variable:

x = [1, 2, 3]
x |= [2, 3, 4, 4]
x #=> [1, 2, 3, 4]