Javascript Array Creation

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 lastItem= this.data[this.length-1]
        delete this.data[this.length-1];
        this.length--;
        return lastItem
        
    }
    delete(index){
        delete this.data[index];
        this.shiftItems(index);
        
    }
    
    shiftItems(index){
        for(let i=index;i<this.length-1;i++){
            this.data[i]=this.data[i+1];
        }
        delete this.data[this.length-1];
        this.length--
    }
    
    shift(){
        const removedData= this.data[0]
        delete this.data[0];
        this.shiftItems(0);
        return removedData;
    }
    
    unshift(item){
         this.length++
         for(let i=this.length-1;i>=0;i--){
            this.data[i]=this.data[i-1];
            
        }
        this.data[0]=item
        
    }
    
    
}



const arr= new MyArray();
arr.push('Hi');
arr.push('Abhishek');
arr.push('You');
arr.push('Are');
arr.push('Awesome');
console.log('After Push',arr);


arr.unshift('Hello');

console.log('After unshift',arr);