[plt-scheme] Passing procedures are parameters.

From: aditya shukla (adityashukla1983 at gmail.com)
Date: Mon Feb 2 19:44:30 EST 2009

Hello guys , i am new to scheme and still learning to think in the
procedural way.I have a question.Is there a way to pass  a predicate as a
parameter .for example
every? predicate lst) returns #f if any element of lst fails to
satisfy predicate, and returns #t otherwise.

> (every? number? '(a b c 3 e))
> (every? number? '(1 2 3 5 4))

I can use map and check is the elements in the list are numbers .But what if
i have to check for any other predicate.I mean can this be generalized.

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