How to get second largest element of array in JavaScript Hacker Rank Question

 

How to get the second largest element of an array  in JavaScript Hacker Rank Question

Hy Friends, Today we will learn How to get a second largest element of array in JavaScript.

This question asked mostly in Interviews.

We can do resolve this in different ways. So lets' Start.

Let's Assume we have Array 

let arr = [ 100, 23 , 45, 145, 44, 22, 5, 6, 33, 55]

First Way -  First we will sort an array in descending order using the javascript sort function and then get the second index. this will be our second largest element of an array. 

arr.sort( (a,b) => b - a)[1] // output 100

Here I have used the arrow function.

Second Way -  

 Step 1- Second way we will get the max number of the array element and store in a variable.

var highest = Math.max.apply('',arr);

Step 2 -  Get the index of the largest number.

var highestIndex = arr.indexOf(highest);

Step 3 -  Assign zero or negative value to the array (arr) 

arr[highestIndex] = 0 ; // - Infinity , -1

Step 4 -   Now again get max number using Math.max.apply function 

var secondHighest = Math.max.apply('',arr);

// output -> 100

Yeah! You have learned 😊

I hope you understood and like this article. if you like it so, please give feedback in the comment section.
If any mistakes I made here, so please let me know and improve me.
If you have any query, feel free to ask me  😊
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