List

class List{

  constructor(){
      this._list = [];
      this.size = 0;
  }

  add(element){
      this._list.push(element);
      this._list.sort((a,b)=>a-b);
      this.size++;
  }

  remove(index){
     this._validate(index)
     this._list.splice(index,1);
     this.size--;
  }

  get(index){
     this._validate(index);
     return this._list[index];
  }

  _validate(index){
    if(index < 0 || index >= this._list.length){
      throw new Error('Index is out of bounds')
    }
  }

}

let list = new List();
list.add(5);
list.add(6);
list.add(7);
console.log(list.get(1));
list.remove(1);
console.log(list.get(1));
console.log(list.size)