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Preview Ruby 4.1 is a preview. It can change before the final release. Switch to Ruby 4.0 →

instance method

FalseClass#&

(untyped obj) -> false
false & object → false
nil & object → false

Returns false:

Example
false & true       # => false
false & Object.new # => false

Argument object is evaluated:

Example
false & raise # Raises RuntimeError.
See also #=== #^ also in 4.0 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0