Question

How to define and use objects in JavaScript

Answer 1

var worker = 
{
    firstName:"Teddy",
    lastName:"Bear",
    age:100,
}; 

document.write(worker.firstName + "<br />");
document.write(worker.lastName + "<br />");
document.write(worker.age + "<br />");

/*
run:

Teddy
Bear
100

*/

 

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Answer 2

var worker = new Object();

worker.firstName = "Teddy";
worker.lastName = "Bear";
worker.age = 100;

document.write(worker.firstName + "<br />");
document.write(worker.lastName + "<br />");
document.write(worker.age + "<br />");

/*
run:

Teddy
Bear
100

*/

 

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Answer 3

function worker(first_name, last_name, age) 
{
    this.firstName = first_name;
    this.lastName = last_name;
    this.age = age;
}

var w1 = new worker("Teddy", "Bear", 100);

document.write(w1.firstName + "<br />");
document.write(w1.lastName + "<br />");
document.write(w1.age + "<br />");

/*
run:

Teddy
Bear
100

*/

 

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Answer 4

var worker = 
{
    firstName:"Teddy",
    lastName:"Bear",
    age:100,
    
    print_details : function() 
    {
       return this.firstName + " " + this.lastName + " " + this.age;
    }
}; 

document.write(worker.print_details());

/*
run:

Teddy Bear 100 

*/

 

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Answer 5

var worker = 
{
    firstName:"Teddy",
    lastName:"Bear",
    age:100,
    
    print_details : function() 
    {
       return this.firstName + " " + this.lastName + " " + this.age;
    },
    
    changeAge : function(age) 
    {
        this.age = age;
    }
}; 

document.write(worker.print_details() + "<br />");
worker.changeAge(120);
document.write(worker.print_details() + "<br />");

/*
run:

Teddy Bear 100
Teddy Bear 120

*/

 

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