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Sec 2.2 introduces several "famous" functional idioms, including the map and reduce function (the MapReduce algorithm is beyond the scope of this study group, but it's inspired by this idea.)

Never joined us before? No worries! Our "problem class" sessions are pretty drop-in friendly. You'll need:

• A scheme or racket repl (e.g. from a laptop)

• To read SICP, sec.2.2 (, or watch the lectures (

• To brush up on SICP Ch1 - know how to define functions, use lambdas and let, and know the difference between iteration and recursion.

Any questions, let me know. See you then.