Web Reference: This topic covers the functional programming paradigm including function types, first-class objects, function application, partial application, composition, higher-order functions (map, filter, reduce/fold), and list processing operations. Aug 23, 2025 · Three common higher order functions are the map, filter and reduce/fold functions: Whilst the examples here are about using the map, filter and reduce/fold functions with lists, other data types can used instead of lists. For example you might map a function across the elements of a tree. AQA expects you to know three specific higher-order functions that are used to process lists. These are map, filter, and reduce (sometimes called fold). The map function applies a specific function to every single item in a list and returns a new list with the results.
YouTube Excerpt: As this is an introduction to FP in Python, I don't talk about all the features of these higher order functions.
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