Higher-order functions: Difference between revisions
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Then test them in the Quackery shell by summing a nest of numbers, recursively flattening a deeply nested nest, reversing every string in a nest of strings, and removing all the negative numbers from a nest of numbers.
For another example of usage of <code>map</code> and <code>filter</code>, see <code>countchars</code> in [[Huffman coding#Quackery]].
<pre>/O> ' [ 1 2 3 4 5 6 7 8 9 10 ] ' + fold echo
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