[Haskell-cafe] [newbie question] Memoization automatic in Haskell?

Hugh Perkins hughperkins at gmail.com
Sat Jan 12 18:16:36 EST 2008

On Jan 12, 2008 10:54 PM, Henning Thielemann
<lemming at henning-thielemann.de> wrote:
> On Sat, 12 Jan 2008, Hugh Perkins wrote:
> > I guess that Haskell's referential transparence means the answers to
> > the isPerfectSquare will be cached, ie automatically memoized? (not
> > sure if is correct term?)
> http://www.haskell.org/haskellwiki/Memoization

Interesting... but I dont understand... I thought that referential
transparence meant that once the answer to a function has been
calculated once, it will always be the same, and that the interpreter
can, and will, cache this answer?

So, if I call f( 20 ) once, for some, arbitrary, f, it will have to go
away and calculate f(20), but if I call it multiple times, it will
just return the value it already calculated?

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