Symbol.Iterator

Symbol.iterator.js

Number = new Proxy(Number, {
  construct(target, args){
    let index = 0
    return {
      [Symbol.iterator]() {
        return this;
      },
      next(){
        let value = args[0].toString()
        if(index < value.length){
          index++;
          return {
            value : value[index - 1]
          }
        }
        else{
          return {
            a : undefined,
            done : true
          }
        }
      }
    }
  },
})