Create private static function in Javascript?

Question

I'm using the following code to create: private property, private method, public property, public method and public static property.

function ClassA() {

    var privateProperty = 'private_default_value';

    var privateMethod = function() {
        console.log("private method executed ...");
    };

    this.publicProperty = 'public_default_value'; 

    this.publicMethod = function() {
        console.log("public method executed ...");
    };

    ClassA.publicStaticProperty = "public_static_default_value";

    // How to create here: ClassA.privateStaticProperty ?

};

var instance = new ClassA();
instance.publicMethod();
console.log(ClassA.publicStaticProperty);

How can I create a private static property in this class ?

Ashraf Bashir · Accepted Answer · 2014-06-27 13:24:56Z

7

Here's a solution using an IIFE to create a scope visible by the the constructor ClassA :

var ClassA = (function(){

    var Constructor = function(){
        var privateProperty = "private_default_value";

        var privateMethod = function() {
            console.log("private method executed ...");
        };

        this.publicProperty = "public_default_value"; 

        this.publicMethod = function() {
            console.log("public method executed ...");
        };
    }
    Constructor.publicStaticProperty = 'public_static_default_value';
    var privateStaticProperty = "private_static_default_value";

    return Constructor;
})();

privateStaticProperty is "static" : there's only one property.

privateStaticProperty is "private" : you can't read it from outside the IIFE.

edited Jun 27, 2014 at 13:24

Ashraf Bashir

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answered Jun 27, 2014 at 12:39

Denys Séguret

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5 Comments

MBO Over a year ago

Rename publicStaticProperty to privateStaticProperty

Ashraf Bashir Over a year ago

@MBO So how to maintain the old public static property in this code also ? could you update it to contain both of public static and private static ... sorry, I get lost

Denys Séguret Over a year ago

Side note : in most cases it's better to define methods on the prototype (i.e. Constructor.prototype.publicMethod = function()...) as it avoids their useless duplication.

Ashraf Bashir Over a year ago

@dystroy I cannot access my public_property anymore ? same for private_property accessing inside the class. How in your code may I have non-static public and non-static private properties ?

Ashraf Bashir Over a year ago

@dystroy You have a bug, I'll edit your answer to fix it

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