VisualMode
Contact us
This project is very much a work in progress. More operators and symbols to come. That said, if you see any errors or omissions, please let me know on Bluesky, Twitter, or via email.
← Back to Ruby Operators

Boolean And

The && (double ampersand) operator is the Boolean And operator. This operator is used to short-circuit at the first occurrence of a falsey value otherwise evaluate to the final truthy value.

> 4 && 5
=> 5
> 4 && nil
=> nil
> 4 && nil && false
=> nil
> 4 && false && nil
=> false

This is typically used as part of an expression where multiple conditions need to be met for the statement to execute.

if account.age < 7.months && domain.unknown?
  return :invalid
end

This is not to be confused with the and operator which has a much lower precedence ↗ than &&. You'll generally want to use && for logical expressions unless you have a specific reason for using and.

See also: &&=

References