Method: Hash#displace

Defined in:
lib/casual_support/hash/displace.rb

#displace(key, value) ⇒ Hash

Associates key with value, and returns key‘s previously associated value. If key had no previously associated value, returns Hash#default.

Examples:

visited = { "id1" => true, "id2" => false }

visited.displace("id1", true)  # == true
visited                        # == { "id1" => true, "id2" => false }
visited.displace("id2", true)  # == false
visited                        # == { "id1" => true, "id2" => true }
visited.displace("id3", true)  # == nil
visited                        # == { "id1" => true, "id2" => true, "id3" => true }

Parameters:

  • key
  • value

Returns:



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# File 'lib/casual_support/hash/displace.rb', line 20

def displace(key, value)
  old_value = self[key]
  self[key] = value
  old_value
end