Learning Functional Programming in Go

Itertools

Itertools is a Go package that provides many of the same high-order functions from the Python standard library.

Next, we see the different types of high-order functions provided by Itertools. High-order functions provide the vocabulary for the declarative coding style.

Infinite iterator creators:

• Count(i): Infinite count from i
• Cycle(iter): Infinite cycling of iter (requires memory)
• Repeat(element [, n]): Repeat the element n times (or infinitely)

Iterator destroyers:

• Reduce(iter, reducer, memo): Reduce (or Foldl) across the iterator
• List(iter): Create a list from the iterator

Iterator modifiers:

• Chain(iters...): Chain together multiple iterators.
• DropWhile(predicate, iter): Drop elements until predicate(el) == false.
• TakeWhile(predicate, ...