Question: Write a function how to find the second largest element of an array or list without any inbuilt function? How to conquer this.

You are in an 15 min interview for a frontend role and you are being asked to find the second largest number from a give list, how would you find this, lets deep down into that.

Question: Write a function how to find the second largest element of an array or list without any inbuilt function?

Anwer:

int findSecondLargestNumber( arr){

if(arr.length < 2) return null;

let largest = arr[0];

let secondLargestNumber = -Infinity;

for(let i =0; i < arr.length; i++){

if(arr[i]>largest){

secondLargestNumber = largest;

largest = arr[i]

}

else if(arr[i]> secondLargestNumber && arr[i] !== largest){

secondLargestNumber = arr[i];

}

}

return(secondLargestNumber);

}

console.log(findSecondLargestNumber([39, 22, 45, 34, 10]);

Please comment if you have better approach to find the second smallest number.