let arr=[-1,-2,-3,-4,-5]; let newAr =[1,6,8,4,5,9]; let mixAr=[35,33,35,32]; function findSecondHighest(ar){ let max= Number.MIN_SAFE_INTEGER; let secondMax=Number.MIN_SAFE_INTEGER; for(var ele of ar){ if(ele>max){ secondMax=max; max=ele; }else if(ele!=max && ele>secondMax){ secondMax=ele; } } return secondMax; } console.log('second max value is',findSecondHighest(arr)); console.log('second max value is',findSecondHighest(newAr)); console.log('second max value is',findSecondHighest(mixAr));