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JavaScript - Constructors

The standard way to create an object with default values is to use an object constructor function. In this example, you must pass a series of arguments to the object constructor to instantiate it. This is also known as a object Prototype. 


function Person(first, last, age, eye)
{
    this.firstName = first;
    this.lastName = last;
    this.age = age;
    this.eyeColor = eye;
}

Here's a good example of creating multiple "persons": 


let father = new Person("John", "Doe", 50, "blue");
let mother = new Person("Sally", "Rally", 48, "green");
let msg = "Father name is " + myFather.firstName + " " + myFather.lastName + "." + "<br />";
msg += "Mother name is " + myMother.firstName + " " + myMother.lastName + "." + "<br />";
document.getElementById("demo1").innerHTML = msg;;