Functional iterator helpers
&cetera (pronounced andcetera) is an iterable helper library (similar to itertools) but with a functional twist. Every operator is a function that returns a function that consumes a passed in iterable, operate on its iterator and returns another iterable. This is optimized to be used in pipelines.
import { map, pipe, range, reduce } from "andcetera";
// Sum of the first five squares.
pipe(
range(1, 6),
map((n) => n ** 2),
reduce((sum, square) => sum + square, 0),
);
// => 55Or if you use the proposed pipeline operator:
import { aside, drop, map, range, reduce, take } from "andcetera/sync";
// Sum of the first five squares and log them to the console as they pass by.
range()
|> drop(1)
|> take(5)
|> map((n) => n ** 2)
|> aside((square) => console.log(square))
|> reduce((sum, square) => sum + square, 0);
// => 55
// Logs 1, 4, 9, 16, 25
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