Solution to HackerRank Climbing the Leaderboards Challenge: https://www.hackerrank.com/challenges/climbing-the-leaderboard/problem?isFullScreen=true

climbingLeaderboard.js

/*
 * Complete the 'climbingLeaderboard' function below.
 *
 * The function is expected to return an INTEGER_ARRAY.
 * The function accepts following parameters:
 *  1. INTEGER_ARRAY ranked
 *  2. INTEGER_ARRAY player
 */

function climbingLeaderboard(ranked, player) {
    const uniqueRank = [... new Set(ranked)];
    let playerRank = [];
    
    for (let i = 0; i < player.length; i++) {     
        while (uniqueRank && player[i] >= uniqueRank[uniqueRank.length - 1])
            uniqueRank.pop();
        playerRank.push(uniqueRank.length + 1);
    }
    
    
    return playerRank;

}