函数柯里化-示例一-代码修复

[Ra-Liz]

这里的示例代码运行传参多一个，且不能达到预期效果。

建议修改成：

const currying = function (fn, ...args) {
  const len = fn.length;
  args = args || [];
  return (...arguments) => {
    const totalArgs = [...args].concat([...arguments]);

    return totalArgs.length >= len
      ? fn.call(this, ...totalArgs)
      : currying.call(this, fn, ...totalArgs);
  };
};

const sum = (a, b, c) => a + b + c;

const newSum = currying(sum);

const res = newSum(1)(2)(3) // 6

console.log(res); 

运行结果：