programming languages - Ruby |= assignment operator

Question

Found table http://phrogz.net/programmingruby/language.html#table_18.4 but unable to find description for |=

How the |= assignment operator works?

Answer 1

When working with arrays |= is useful for uniquely appending to an array.

>> x = [1,2,3]
>> y = [3,4,5]

>> x |= y
>> x
=> [1, 2, 3, 4, 5]