# Ruby |= pipe assignment operator

```ruby
irb(main):021> arr = [3]
=> [3]
irb(main):022> arr |= [3]
=> [3]
irb(main):023> arr |= [3, 2]
=> [3, 2]
irb(main):024> arr |= [3, 2]
=> [3, 2]
```