0
2
Rasi
answered Nov 30 '-1 00:00
use Symbol to make private property of object
var Product= (function() {
var nameSymbol = Symbol('name');
function Product(name) {
this[nameSymbol] = name;
}
Product.prototype.getName = function() {
return this[nameSymbol];
};
return Product;
}());
var product = Product ('Apple');
console.log(product.getName());//Apple
delete product.name;//true
console.log(product.getName());//Apple
when we use Symbol we cant able to delete property product.name or delete product.nameSymbol (try to delete Symbol ) but still we get result at product.getName()
1
yogi
answered Nov 30 '-1 00:00
use let statement to make private property
let statement make available to local scope only , by that we can make the private property.
var Constructor
{
let privateScope = {};
SomeConstructor = function SomeConstructor () {
this.someProperty = "me publicly aviliable ";
privateScope.hiddenProperty = "me private , sorry not aviliable";
}
SomeConstructor.prototype.showPublic = function () {
console.log(this.someProperty); // me publicly aviliable
}
SomeConstructor.prototype.showPrivate = function () {
console.log(privateScope.hiddenProperty); // me private , sorry not aviliable
}
}
var obj = new SomeConstructor();
obj .someProperty ;// me publicly aviliable
obj .privateScope.hiddenProperty;//undefined
when you try to access hiddenProperty . it will return undefined because by let statement hiddenProperty only available that local scope , not available globally
if you change let privateScope = {}; with var privateScope = {}; it become private to public and available out of function , become global
0
ravi
answered Nov 30 '-1 00:00
Module Pattern in JavaScript
var counter = (function(){
var i = 0;
return {
get: function(){
return i;
},
set: function( val ){
i = val;
}
};
}());
counter.get(); // 0
counter.set( 3 )//3
counter.get(); // 3
counter.i;//undefined
function return object and we cant able to get object 's property . it become private for current function
its work as singleton pattern