You can use it with other functions that use iterators. For example, here is code that makes a copy of a map keeping only the even keys. maps.Collect(xiter.

You can use it with other functions that use iterators. For example, here is code that makes a copy of a map keeping only the even keys. maps.Collect(xiter.Filter2(func(k, v int) bool { return k%2 == 0 }, maps.All(m)))