Web Reference: Folds a binary function f over axis k of arr. The result has the shape of arr but with axis k removed. The three-argument variant uses the first value of each row in axis k as init. It therefore requires axis k to have positive length. Notice that the second example returns an array of reversed lists. This is therefore a left fold; see foldl. Feb 9, 2017 · Okay, I am new with scheme/racket/lisp. I am practicing creating my own functions, syntax, and recursion, so I want to make my own foldl and foldr functions that do exactly what the predefined versions do. So that was an example of how you can use foldl to implement filter, and use it to produce a new list. Unlike map, the result list can be a different length than the input list!
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