Though Pyret is not pure, our emphasis is heavily on "functional first", even for objects. We believe state should be used carefully and for good reasons. HtDP

Though Pyret is not pure, our emphasis is heavily on "functional first", even for objects. We believe state should be used carefully and for good reasons. HtDP (www.htdp.org) has two whole chapters on state at the end, giving design recipes for their use, and I'm revising some of these in PAPL (papl.cs.brown.edu/2013/).