Struct and object oriented in JavaScript [duplicate]

Question

I come from C, C++, Java background. I want to create a struct/ class with some attributes and methods like:

MyClass{
    string text;
    array characters;
    printText(){ 
       print text;
    }
    printLen(){
       print characters.length();
    }
}

So next time I can create an object like above by just calling its constructor. How do I implement this in JavaScript? I am new to the programming principles followed in javascript, I want to create a custom data type here for reusability.

Have you searched for anything yet? This is one of the most common questions. It is really simple. Good luck! — Zack Argyle
– Zack Argyle, Commented Aug 14, 2014 at 16:24
developer.mozilla.org/en-US/docs/Web/JavaScript/… or just look for related questions is SO — briosheje
– briosheje, Commented Aug 14, 2014 at 16:26
Great reference about javascript patterns: addyosmani.com/resources/essentialjsdesignpatterns/book take a look at Constructor Pattern. Also, Module and Singleton. — Christian Benseler
– Christian Benseler, Commented Aug 14, 2014 at 16:27

Callebe · Accepted Answer · 2014-08-14 16:27:14Z

1

function MyClass () {
    this.text = "";
    this.characters = [];
}

MyClass.prototype.printText = function () {
    console.log(this.text);
};

MyClass.prototype.printLen = function () {
    console.log(this.characters.length);
};

var instance = new MyClass();
instance.text = "test";
instance.characters.push('a');
instance.characters.push('b');
instance.printText();
instance.printLen();

answered Aug 14, 2014 at 16:27

Callebe

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6 Comments

briosheje Over a year ago

this.characters.length rather than this.characters.lengt Moreover, we don't know whathe means by "print".

Callebe Over a year ago

It is just an example.

Nitin Labhishetty Over a year ago

I want to create a javascript library where I define such contructs. Is this a good way in such a context?

Callebe Over a year ago

You must to declare your library in one file and include it using a HTML SCRIPT tag. <script type="text/javascript" src="path/to/your/library.js"></script>

Nitin Labhishetty Over a year ago

I meant is it a good design principle?

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