gen_fakearray.js

let fakearray={

    [Symbol.iterator](){

        let x=0,done=false;

        return {
                  next(){
                     x++;
                     if(x>10)done=true;
                     return {value:x,done};   
                  }
               } //@return object with next() method

         }
}

console.log([...fakearray]); //@returns [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]