Looking for a solid approach to defining private and protected properties and methods in Javascript? Check out this helpful discussion here on the site. Unfortunately, the current version of Prototype (1.6.0) doesn't offer a built-in method through its Class.create() syntax.
Curious about best practices when it comes to defining private and protected properties and methods within the context of using Prototype? Are there more effective alternatives to consider beyond the standard options?
To achieve encapsulation in your constructor function for prototype methods, you can utilize local variables and create a closure that allows access to these variables in your public methods.
Check out the following code example:
// properties are passed directly to the `create` method
var Person = Class.create({
initialize: function(name) {
// Define protected variable
var _myProtectedMember = 'just a test';
this.getProtectedMember = function() {
return _myProtectedMember;
}
this.name = name;
},
say: function(message) {
return this.name + ': ' + message + this.getProtectedMember();
}
});
To further explore this concept, refer to Douglas Crockford's insights on private members:
If you're curious about implementing private variables for classes, check out this insightful discussion on Prototype's lighthouse here. It explains why achieving this effect with Prototype's Class.create isn't possible.
To create public methods as closures, follow the example provided below:
Bird = Class.create (Abstract,(function () {
var string = "...and I have wings"; //private instance member
var secret = function () {
return string;
} //private instance method
return {
initialize: function (name) {
this.name = name;
}, //constructor method
say: function (message) {
return this.name + " says: " + message + secret();
} //public method
}
})());
Owl = Class.create (Bird, {
say: function ($super, message) {
return $super(message) + "...tweet";
} //public method
})
var bird = new Bird("Robin"); //instantiate
console.log(bird.say("tweet")); //public method call
var owl = new Owl("Barnie"); //instantiate
console.log(owl.say("hoot")); //public method call inherit & add
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