Method: Multimap#index

Defined in:

lib/multimap.rb

#index(value) ⇒ Object

call-seq:

map.index(value)    => key

Returns the key for a given value. If not found, returns nil.

map = Multimap["a" => 100, "b" => [200, 300]]
map.index(100)   #=> "a"
map.index(200)   #=> "b"
map.index(999)   #=> nil

# File 'lib/multimap.rb', line 301

def index(value)
  invert[value]
end