contructorPattern.js

function Person(firstName, lastName) {    
    this.firstName = firstName;    
    this.lastName = lastName;    
    this.showName = function () {       
        console.log(this.firstName + '- ' + this.lastName);    
    }
}
var psn1 = new Person('manh', 'nguyen');
psn1.showName();  // I'm manh- nguyen