Second Largest Number in Array

 Given an array find second largest number

Code

let arr=[12,9,13,34,-45,12,67]

let unique = [...new Set(arr)]

console.log("Unique Array:",unique)

unique.sort((a,b)=>b-a)

console.log("Sorted Array:",unique)

console.log("Second Largest Number:",unique[1])

Output:

        [ 12, 9, 13, 34, -45, 67 ]

        [ 67, 34, 13, 12, 9, -45 ]

        Second Largest Number: 34

In form of function:

function findNthLargest(arr,n){

    let unique = [...new Set(arr)]

    unique.sort((a,b)=>b-a)

    if (unique.length < n){

        throw new Error("Array can't have nth largest number")

    }else{

        return unique[n-1]

    }

}

let arr=[12,9,13,34,-45,12,67]

let n=3

console.log(n + "th Largest Number:" + findNthLargest(arr,n))

Output:

    3th Largest Number:13