Higher-order functions: Difference between revisions

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fold.act release ] is fold ( [ x --> x )</pre>
 
Then test them in the Quackery shell by reversing every string in a nest of strings, removing all the negative numbers from a nest of numbers, and flattening a deeply nested nest.
 
<pre>/O> $ "esreveR yreve gnirts ni a tsen fo .sgnirts" nest$
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