Laziness Weirds Programming

So I thought about it tonight and figured out that in Haskell I can generate the Fibonacci sequence using the definition

let l = [1,1] ++ zipWith (+) l (tail l)

If you type this at ghci you can say "take 20 l" and get

[1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,1597,2584,4181,6765]

Laziness weirds programming. Friend of Bart

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