[plt-scheme] what is fold-left?

From: Mike Eggleston (mikeegg1 at me.com)
Date: Wed Feb 11 22:24:43 EST 2009

On Wed, 11 Feb 2009, Mike Eggleston might have said:

> Morning,
> I'm looking at some code at
> <http://funcall.blogspot.com/2007/08/naive-bayesian-classifier.html>. This
> code by default will not run in DrScheme. The code is using (fold-left
> ...). Looking at the function it looks like a (map ...), but I don't
> (yet) know why I can't just use a 'map' instead of the 'fold-left'.
> Any ideas? What does this function do that 'map' doesn't and why
> should it be used?
> Mike

I found a reference here:


How to I call this library? I'm using '#lang scheme' as the first
line of my file.


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