What does ||= (or-equals) mean in Ruby?

Question

What does the following code mean in Ruby?

||=

Does it have any meaning or reason for the syntax?

Answer 1

This ruby-lang syntax. The correct answer is to check the ruby-lang documentation. All other explanations obfuscate.

Google

"ruby-lang docs Abbreviated Assignment".

Ruby-lang docs

https://docs.ruby-lang.org/en/2.4.0/syntax/assignment_rdoc.html#label-Abbreviated+Assignment