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                ```js function fn1(x) { return x + 1; } function fn2(x) { return x + 2; } function fn3(x) { return x + 3; } function fn4(x) { return x + 4; } // const a = compose(fn1, fn2, fn3, fn4) // a(1) // 1 + 1 + 2 + 3 + 4 function compose(...arg1) { // arg1存儲組合的函數數組 return function(...arg2) { // args存儲最外層函數執行需要傳遞的實參 if (arg1.length === 0) { return arg2 // 無compose函數,不做處理 } if (arg1.length === 1) { return arg1[0](...arg2) } return arg1.reduce((pre, cur) => { // 第一次pre的值,第一個函數執行的實參,cur是一個函數 // 第二次pre的值,上一次執行的返回值,作為參數傳遞給下一個cur return cur(pre) }, ...arg2) } } ```
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