2020-11-19 柯里化函数面试题解答

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        function fun(a) {
            var fun2 = (b) => {
                sum += Math.pow(b, 2);
                fun2.value = sum;
                return fun2;
            }
            fun2.value = Math.pow(a, 2)
            let sum = fun2.value;
            return fun2;
        }
        console.log(fun(1).value)
        console.log(fun(1)(2).value)
        console.log(fun(1)(2)(3).value)
        console.log(fun(1)(2)(3)(4).value)
        console.log(fun(1)(2)(3)(4)(5).value)

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