// Determine function for transforming degrees to radians
var toRadiant = function (g) {
    if (g != null) {
        if (PP.isNumber(g)) {
            /* If parameter is a number, 
               transform the specified value to radians */
            return PP.g2r(g);
        } else {
            /* Otherwise generate an error with a message about invalid type of argument */
            throw PP.ArgumentException("Wrong type of argument", this);
        }
    } else {
        // Function parameter cannot be null
        throw PP.ArgumentNullException("Argument cannot be null", this);
    }
};
// Transform degrees to radians
console.log("45° = " + this.toRadiant(45) + " rad");
console.log("60° = " + this.toRadiant(60) + " rad");
console.log("90° = " + this.toRadiant(90) + " rad");