Public Private Function
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Public Private Function
// Shows the accordion content with the ID `#some-content`
houdini . openContent ( '#some-content' );
// Hides the accordion content with the ID `#some-other-content`
houdini . closeContent ( '#some-other-content' );
var adjustFocus = function ( content , settings ) {
// Do stuff...
};
var beNice = ( function () {
'use strict' ;
// My public methods will get added to this object
var publicAPIs = {};
// A private method
var saySomethingNice = function ( somethingNice ) {
alert ( somethingNice );
};
// A public method
publicAPIs . smile = function ( message ) {
if ( message ) {
saySomethingNice ( message );
} else {
saySomethingNice ( 'You make the world better just by being you!' );
}
};
// Return our public methods so that they can be accessed
return publicAPIs ;
})();
Uncaught ReferenceError : saySomethingNice is not defined
Today, reader Kevin Marmet asked (shared with permission):
I’m trying to understand #javascript patterns — especially private and public functions.
So what’s the difference between a public and private function?
A private function can only be used inside of it’s parent function or module. A public function can be used inside or outside of it. Public functions can call private functions inside them, however, since they typically share the same scope .
Providing public access to some functions but not others is helpful when building plugins and other modular scripts.
For example, in Houdini, an accordion script I wrote, users initialize the plugin like this.
The init() method is a public function.
While the script automatically opens and closes accordion content when users click toggle links, I also provide developers with the ability to dynamically open or close content from their own scripts using some additional public methods.
In this example, openContent() and closeContent() are also public methods.
Houdini also includes some private methods that are used within the plugin, but can’t be access by developers. For example, I use a helper function to bring newly opened content into focus for visitors using assistive technology like screen readers.
This function cannot be called from another developer’s script. It’s private.
The secret sauce that makes this all work is a JavaScript pattern known as the Revealing Module Pattern .
Here’s an example of a plugin called beNice() that you can use to say nice things.
The smile() method is public. You can pass in a message as an argument, or let it create one for you. It uses the private saySomethingNice() method to alert() your message.
If you call beNice.smile() (with or without a message passed in), it will show an alert with a nice message. If you try to call saySomethingNice() , you’ll get an error.
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What is the difference between public, private, and protected in PHP?
Difficulty Level :
Hard Last Updated :
15 Oct, 2018
public $tag_line = "A Computer Science Portal for Geeks!" ;
echo $this ->tag_line. "" ;
// A Computer Science Portal for Geeks!
// A Computer Science Portal for Geeks!
// A Computer Science Portal for Geeks!
echo $sum = $this ->x- $this ->y . "" ;
function mul() //Multiply Function
echo $sub = $this ->x* $this ->y;
private $name = "A Computer Science Portal for Geeks!" ;
echo "This is private method of base class" ;
// Uncaught Error: Call to private method demo::show()
protected $protected = 'Protected' ;
private $private = 'Private' ;
echo $this -> protected ;
echo $obj -> protected ; // Cannot access protected property
echo $obj -> private ; // Cannot access private property
$obj ->Display(); //Displays all properties
public $public = 'Public Sub Class' ;
protected $protected = 'Protected Sub Class' ;
echo $this -> protected ;
echo $obj2 -> protected ; // Cannot access protected property
echo $obj2 -> private ; // Cannot access priavte property
$obj2 ->Display(); //Displays all properties
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Got It !
Public, private and protected are called access modifiers. Just like C++, PHP also have three access modifiers such as public, private and protected. The visibility of a property, a method or a constant can be defined by prefixing the declaration with these keywords.
Public Access modifier: This modifier is open to use inside as well as outside the class. Example:
Protected Access modifier: This modifier is open to use within the class in which it is defined and its parent or inherited classes.
Private Access modifier: This modifier is open to use within the class that defines it. ( it can’t be accessed outside the class means in inherited class).
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