Delete Item in array any position

Array.prototype.deleteItem=function(pos){
if(this.length>pos &&pos>=0){
for(let i=pos;i<this.length-1;i++){
this[i]=this[i+1]
}
this.length=this.length-1
}else{
throw new Error("Please Enter valid position")
}
console.log(this)
}

let a=[52,65,53,59,1,25]
a.deleteItem(90)