method

add?

Ruby latest stable (v1_9_3_392) - 0 notes - Class: Set

add?(o) public

Adds the given object to the set and returns self. If the object is already in the set, returns nil.

# File lib/set.rb, line 236
  def add?(o)
    if include?(o)
      nil
    else
      add(o)
    end
  end