const obj = {
            "0": "xm",
            "sex": "male",
            length: 2
        };
        obj[Symbol.iterator] = ()=>{
            let index = 0;
            return {
                next(){
                    index++;
                    let value,done;
                    if(index === 1){
                        return {
                            value : obj[0],
                            done:false 
                        };
                    }
                    else if(index === 2){
                        return {
                            value:obj.sex,
                            done:false
                        };
                    }
                    else if(index === 3){
                        return {
                            value:obj.length,
                            done:false
                        };
                    }
                    else{
                        return {
                            done:true
                        };
                    }
                }
            }
        }
        for(const item of obj){
            console.log(item);
        }