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2019-09-27, 11:23:50
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2019-09-27, 13:06:55
Idiom #189 Filter a list by member and whole list and transform result
A common theme is collecting a top N entries from a list and returning a sparse version of the object to conserve bandwidth. In mathematical terms: Produce a list x with members i where P(i,x) is true, transforming i with T.
Idiom #189 Filter and transform list
Produce a new list y containing the result of function T applied to all elements of list x that match the predicate P.