Just a simple implementation of nth prime number in JS

nth_prime_number.js

function nthPrime(n) {
    var P = 0;

    function isPrime(x) {
        var isPrime= true;

        for (var d = 2; d <= Math.sqrt(x); d++) {
            if((x/d) % 1 == 0) {
                isPrime = false;
                break;
            }
        }

        return isPrime;
    }

    for (var i = 1; 0 < n; i++) {

        if(isPrime(i)) {
            P = i; n--;
        }

        // we can skip the even numbers
        if(3 <= i){
            i++;
        }

    }

    return P;
}