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                >[success] # 函數轉換 ~~~ 1.實現效果 add(1, 2)(3, 4, 5)(6) // 21 2.實現須知:要實現這個要求,我們必須知道函數相關的兩個隱式轉換函數 toString() 和 valueOf()。 toString() 函數會在打印函數的時候調用,比如 console.log、valueOf 會在獲取函數原始值時調用, 比如加法操作。 ~~~ ~~~ function add(...args) { ? let arr = args ? function fn(...newArgs) { ? ? arr = [...arr, ...newArgs] ? ? return fn; ? } ? fn.toString = fn.valueOf = function() { ? ? return arr.reduce((acc, cur) => acc + parseInt(cur)) ? } ? return fn } ~~~
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