Untitled

// Online Javascript Editor for free
// Write, Edit and Run your Javascript code using JS Online Compiler

let user = {
    minLength : 5,
    maxLength : 100,
    [Symbol.iterator]() {
        this.current = this.minLength;
        return this;
    },
    next() {
       if (this.current <= this.maxLength) {
        return { done: false, value: this.current++ };
      } else {
        return { done: true };
      } 
    }
    
}

// user[Symbol.iterator] = function () {
//     return {
//     current: this.minLength,
//     last: this.maxLength,

//     next() {
//       if (this.current <= this.last) {
//         return { done: false, value: this.current++ };
//       } else {
//         return { done: true };
//       }
//     }
//   };
// }


for (let num of user) {
  alert(num);
}

console.log(user);