Pattern Matching - language feature

Example from Haskell:

fib 0 = 1
fib 1 = 1
fib n | n >= 2
      = fib (n-1) + fib (n-2)

Example from Elixir:

def fib(0), do: 1
def fib(1), do: 1
def fib(n) when n >= 2, do: fib(n-1) + fib(n-2)

Example from Coconut:

match [head] + tail in [0, 1, 2, 3]:
   print(head, tail)

Example from Felix:

match x with
 | Some x => println$ x; 
 | None => println "NONE";
 endmatch;

Languages with Pattern Matching include Rust, Haskell, Elixir, Coconut, HOPE, Felix, NPL

Languages without Pattern Matching include progsbase

Read more about Pattern Matching on the web: 1.

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