Flowdock
freeze() public

Prevents further modifications to obj. A TypeError will be raised if modification is attempted. There is no way to unfreeze a frozen object. See also Object#frozen?.

   a = [ "a", "b", "c" ]
   a.freeze
   a << "z"

produces:

   prog.rb:3:in `<<': can't modify frozen array (TypeError)
    from prog.rb:3
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