Hackerrank | 10 Days of Javascript | Day 3-Solution in JS | Arrays-hackerrank-Solution-in-JS

Hackerrank | 10 Days of Javascript | Day 3-Solution in JS | Arrays-hackerrank-Solution-in-JS

Objective

In this challenge, we learn about Arrays. Check out the attached tutorial for more details.

Task

Complete the getSecondLargest function in the editor below. It has one parameter: an array, , of  numbers. The function must find and return the second largest number in .

Input Format

Locked stub code in the editor reads the following input from stdin and passes it to the function:
The first line contains an integer, , denoting the size of the  array.
The second line contains  space-separated numbers describing the elements in .

Constraints

• , where  is the number at index .
• The numbers in  are not distinct.

Output Format

Return the value of the second largest number in the  array.

Sample Input 0

5
2 3 6 6 5

Sample Output 0

5

Explanation 0

Given the array , we see that the largest value in the array is  and the second largest value is . Thus, we return  as our answer.

https://www.hackerrank.com/challenges/js10-arrays/problem

Day 3: Arrays Solution in JS

'use strict';

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', inputStdin => {
    inputString += inputStdin;
});

process.stdin.on('end', _ => {
    inputString = inputString.trim().split('\n').map(string => {
        return string.trim();
    });
    
    main();    
});

function readLine() {
    return inputString[currentLine++];
}

/**
*   Return the second largest number in the array.
*   @param {Number[]} nums - An array of numbers.
*   @return {Number} The second largest number in the array.
**/
function getSecondLargest(nums) {
    var sorted_array = nums.sort(function (a,b) {return a - b;});
    var unique_sorted_array = sorted_array.filter(function(elem, index, self) {
        return index === self.indexOf(elem);})

    return unique_sorted_array[unique_sorted_array.length - 2];
}


function main() {
    const n = +(readLine());
    const nums = readLine().split(' ').map(Number);
    
    console.log(getSecondLargest(nums));
}