const arr = [100,10,3,4,20,50];

                  function largestNoFromArr(arr){
                    let res = arr[0];
                    for(let i=0; i <arr.length; i++){
                     let curr = arr[i];
                     if(curr > res){
                     res = curr
                     }
                    }
                    return res;
                  }
                  
                  const op = largestNoFromArr(arr);
                  console.log(op)