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>> lambda {} == proc {} => true Can you shed some light on the difference? I always thought that lambda is simply a synonym for proc - has this changed in more

• carbon8 17y ago
  See here: http://www.robertsosinski.com/2008/12/21/understanding-ruby-blocks-procs-and-lambdas/ http://www.robertsosinski.com/2008/12/21/understanding-ruby-... Proc objects created with lambda check arguments and have "diminutive return" so they behave as anonymous methods. Also, Kernel#proc is an alias to Kernel#lambda, so the only way you get the bare Proc behavior is by calling Proc.new directly.
  • blubb 17y ago
    Ah, I didn't know that Proc.new != proc/lambda :) They both return Proc objects though, so I wonder if it is possible to "convert" them.
    • carbon8 17y ago
      One small note, as pointed out in http://innig.net/software/ruby/closures-in-ruby.rb http://innig.net/software/ruby/closures-in-ruby.rb posted by arohner above: although in 1.8 proc is an alias for lambda, in 1.9 it's now an alias for Proc.new.
• FooBarWidget 17y ago
  The empty lambda or empty proc is a special object that always points to the same instance. Probably some kind of optimization.