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</source>
=== Haskell ===▼
In [[Haskell_(programming_language)|Haskell]], with its [[lazy evaluation]] model, everything is a generator - every datum created with non-strict data constructor that is, generated on demand. For example,▼
<source lang="haskell">▼
fibgen (a,b) = a : fibgen (b,a+b)▼
-- Main> take 10 (fibgen (0,1))▼
-- [0,1,1,2,3,5,8,13,21,34]▼
</source>▼
where <code>(:)</code> is a non-strict list constructor, ''cons''.▼
== Other Implementations ==
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=== Lisp ===
[[Common Lisp]] also does not natively provide generators, yet various library implementations exist, such as [http://cliki.net/pygen pygen].
▲=== Haskell ===
▲In [[Haskell_(programming_language)|Haskell]], with its [[lazy evaluation]] model, everything is a generator - every datum created with non-strict data constructor that is, generated on demand. For example,
▲<source lang="haskell">
▲fibgen (a,b) = a : fibgen (b,a+b)
▲-- Main> take 10 (fibgen (0,1))
▲-- [0,1,1,2,3,5,8,13,21,34]
▲</source>
▲where <code>(:)</code> is a non-strict list constructor, ''cons''.
==See also==
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