tricu

A lazy functional language based on Tree Calculus
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choices.tri (513B)

      1 !export *
      2 
      3 -- Choose a message by matching an input.
      4 message 0 = "Your basket is empty."
      5 message 1 = "You have one item."
      6 message _ = "You have several items."
      7 
      8 -- These equations are tried from top to bottom.
      9 -- _ matches any remaining input: this is the fallback.
     10 emptyBasket = message 0
     11 oneItem = message 1
     12 fullBasket = message 4
     13 
     14 -- Try adding a message for 2 items before the fallback equation.
     15 -- Keep the equations together so they define one function.
     16 -- Next: a Practical Example, or Language reference.