Hackerrank Implementation Challenge (Kangaroo)

hackerrank_kangaroo.js

function main() {
    var x1_temp = readLine().split(' ');
    var x1 = parseInt(x1_temp[0]);
    var v1 = parseInt(x1_temp[1]);
    var x2 = parseInt(x1_temp[2]);
    var v2 = parseInt(x1_temp[3]);
    
    // return NO, if the first or second kangaroo is far ahead of each other.
    if ((x2 > x1 && v2 > v1) || (x1 > x2 && v1 > v2)) {
        console.log("NO");
        return;
    }
    
    function kangaMove(k1, k2, n = 0) {
        if (n === 10000) {
            return "NO";
        }
        else if (k1 === k2) {
            return "YES";
        }
        
        n1 = k1 + v1; // Kangaroo1 next move;
        n2 = k2 + v2; // Kangaroo2 next move;
        
        return kangaMove(n1, n2, n + 1);
    }
    
    console.log(kangaMove(x1, x2));
}