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Re^5: If I was forced to use only one kind of loop for the rest of my days it would be a

by ambrus (Abbot)
on Sep 30, 2005 at 15:59 UTC ( #496454=note: print w/replies, xml ) Need Help??


in reply to Re^4: If I was forced to use only one kind of loop for the rest of my days it would be a
in thread If I was forced to use only one kind of loop for the rest of my days it would be a

Please read what I said in the parent node.

That's not a proper list, so r5rs doesn't guarantee this will work. It does work with some scheme implementations, but MzScheme says

for-each: expects type <proper list> as 2nd argument, given: #0=(1 . # +0#); other arguments were: #<procedure:STDIN::59>
if I type this code in it.

Update: let me quote from the r5rs.

Pairs are used primarily to represent lists. A list can be defined recursively as either the empty list or a pair whose cdr is a list. More precisely, the set of lists is defined as the smallest set X such that

  • The empty list is in X.
  • If LIST is in X, then any pair whose cdr field contains LIST is also in X.
and later
library procedure: map proc list1 list2 ...,
The LISTs must be lists, and PROC must be a procedure taking as many arguments as there are lists and returning a single value. If more than one LIST is given, then they must all be the same length. `Map' applies PROC element-wise to the elements of the LISTs and returns a list of the results, in order. The dynamic order in which PROC is applied to the elements of the LISTs is unspecified.
library procedure: for-each proc list1 list2 ...,
The arguments to `for-each' are like the arguments to `map', but `for-each' calls PROC for its side effects rather than for its values. Unlike `map', `for-each' is guaranteed to call PROC on the elements of the LISTs in order from the first element(s) to the last, and the value returned by `for-each' is unspecified.
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