CS115 Lecture Notes - Lecture 9: Long Term Ecological Research Network
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17 Dec 2016
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1 parameter consumes type a and produces bool (pred) 1 parameter consumes type a produces type any. A list of type a a list of type a. The length of the produced list is equal to or smaller than the consumed one. A list of type a a list of type any. The length of the produced list is equal to the consumed one ( lter even? (list 1 2 3 4 5)) => (list 2 4) (map even? (list 1 2 3 4 5)) => (list false true false true false) foldr. Implementation of folder (de ne (foldr combine base alst) (cond. [else (combine ( rst aslt) (foldr combine base (rest alst)))])) combine function: consumes 2 parameters (one is type a, the other is type b) and produces type b base: type b alst: list of type a. Examples: (foldr + 0 (list 1 2 3)) => 6 (foldr * 1 (list 1 2 3))
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