Stream generators (original) (raw)

Brian Goetz brian.goetz at oracle.com
Fri Nov 30 09:21:37 PST 2012

We've got a few generators for infinite streams already implemented. For object streams:

// produces seed, f(seed), f(f(seed)), ... iterate(T seed, UnaryOperator f)

// infinite constant sequence repeat(T t)

// finite constant sequence repeat(int n, T t)

// infinite sequence driven by a supplier function repeatedly(Supplier f)

// finite sequence driven by a supplier function repeatedly(int n, Supplier f)

// infinitely cycle through an Iterable cycle(Iterable iterable)

For integer streams, the above, plus

range(int from, int to) range(int from, int to, int step)

Ignoring naming for the time being:

Do these carry their weight?
Are we missing any?
What related functionality are we missing that might undermine the utility of these (e.g., zip)?