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16 lines
314 B
16 lines
314 B
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Exercise 2.28: Write a procedure fringe
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that takes as argument a tree (represented as a list) and returns a list whose
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elements are all the leaves of the tree arranged in left-to-right order. For
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example,
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(define x
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(list (list 1 2) (list 3 4)))
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(fringe x)
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(1 2 3 4)
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(fringe (list x x))
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(1 2 3 4 1 2 3 4)
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