reverseArray

let arr1= [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16];
let arr2= [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16];


function reverseArray(ar){
    let rev=[];
    let len=ar.length;
    for(let i = len-1 ; i>=0  ;i--){
        rev.push(ar[i]);
    }
    return rev;
}
function reverseSameArray(ar,start=0,end=ar.length-1){
    while(start<end){
        let temp=ar[start];
        ar[start]=ar[end];
        ar[end]=temp;
        start++;
        end--;
    }
    return ar;
}


console.log('reversed array method 1',reverseArray(arr2));

console.log('reversed array method 2',reverseSameArray(arr1));