"foo" >> bar = nil || "bar" => "bar" That makes sense. But!: def testor (&block) foo = block or "foo" bar = block || "bar" return foo, bar, block end >> testor() => [nil, "bar …"> "foo" >> bar = nil || "bar" => "bar" That makes sense. But!: def testor (&block) foo = block or "foo" bar = block || "bar" return foo, bar, block end >> testor() => [nil, "bar …">

Illogical or

2011-09-01

by Paul Agapow

in programming

tagged ruby, programming, wtf

'Or' or something else.

In which we consider the difference between or and || in Ruby. The secret is ... it depends. On context.

Behold:

>> foo = nil or "foo"
=> "foo"
>> bar = nil || "bar"
=> "bar"

That makes sense. But!:

def testor (&block)
   foo = block or "foo"
   bar = block || "bar"
   return foo, bar, block
end

>> testor()
=> [nil, "bar", nil]

Ruby, WTF?

Tweets by @agapow