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                [TOC] ## 概述 管理多個輔助函數或比定義變量 在 local 中定義的是局部的變量,函數,結構體,在 local 外是無效的 ## 語法 ``` <exp>=(local (<det-1>..<def-n>) <exp> ) 注釋: <det-1>..類型 或 = (define (<var><var><var>) <exp>) 或 或 =(define <var> <exp>) 或 =(define-struct <var> (<var>...<var>)) ``` 這些 `det` 被稱為局部的變量,函數,結構體 ## 例子 ``` (local ( (define (f x) (+ x 5)) (define (g alon) (cond [(empty? alon) empty] [else (cons (f (first alon)) (g (rest alon)))]))) (g (list 1 2 3))) ;; f 與 g 成為局部定義的函數 ;; local 的表達式豬蹄是 (g (list 1 2 3)) ```
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