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Alex Rivera
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Can anyone help me better understand how to write a stream? I understand that a stream is an infinite sequence of values and the way I have learned programming them is a representing them as a thunk that when called produces a pair of (1) the first element in the sequence and (2) a thunk that represents the stream for the second-through-infinity elements For example: (define powers-of-two (letrec ([f (lambda (x) (cons x (lambda () (f (* x 2)))))]) (lambda () (f 2)))) I understand here that it is just producing a powers of two and to access these for example calling (car (powers-of-two)) would result in 2 and calling (car ((cdr (powers-of-two)))) would result in 4 Now I am trying to write a stream called red-blue that alternates between strings red and blue but I am a little confused about how to construct it
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