class MyArray{ constructor(){ this.length=0; this.data={}; } get(index){ return this.data[index]; } push(item){ this.data[this.length]=item; this.length++; return this.length; } pop(){ const lastItme=this.data[this.length-1]; delete this.data[this.length-1]; this.length--; return lastItme; } } const arr1=new MyArray(); arr1.push(2); arr1.push(3); arr1.push(4); arr1.push(5); arr1.push(6); console.log(arr1);