js函数柯里化的方法和作用实例分析

const curry = (fn, ...args) =>{
   console.log('args',args)
  // console.log(fn.length,args.length)
  return args.length < fn.length
  // 参数长度不足时，重新柯里化该函数，等待接受新参数
  ? (...arguments) => {
    console.log('arguments',arguments)
    return curry(fn, ...args, ...arguments)
  }
  // 参数长度满足时，执行函数
  : fn(...args);
}
function sumFn(a, b, c) {
  return a + b + c;
}
var sum = curry(sumFn); 
const one = sum(2)
console.log('one:',one.toString())
const two = one(3)
console.log('two:',two.toString())
const three = two(5)
console.log('three:',three.toString())
 
//console.log(sum(2)(3)(5));//10
// console.log(sum(2, 3, 5));//10
// console.log(sum(2)(3, 5));//10
// console.log(sum(2, 3)(5));//10