Araays

Task

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

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, $n$, denoting the size of the $nums$ array. The second line contains $n$ space-separated numbers describing the elements in $nums$.

Constraints

• $1 < n < 10$
• $0 < nums < 100$, where $nums$, is the number at index $i$.
• The numbers in $nums$ are not distinct.

Output Format

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

Sample Input

5
2 3 6 6 5

Sample Output

5

Dev

'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) {
    // Complete the function
    let firstBigNum = 0, secondBigNum = 0;

    for (const num in nums) {
        if (firstBigNum < nums[num]) {

            if (firstBigNum > secondBigNum) {
                secondBigNum = firstBigNum;
            }
            firstBigNum = nums[num];
        } else if (firstBigNum != nums[num]) {
            if (secondBigNum < nums[num]) {
                secondBigNum = nums[num];
            }
        }
    }

    return secondBigNum;
}

Study

Java 향상된 for문과 Javascript 향상된 for문이 헷갈려 당황했다.

int[] s = {2, 13, 45, 65 ,45};
for(int i : s) {
   System.out.println(i);
 }

 const s = [2, 13, 45, 65, 45];
 for (const i in s) {
   console.log(s[i]);
 }

js에서 향상된 for문은 배열의 요소가 아닌 인덱스를 가져온다.