javascript - How to make the variable available in the methods of the class? -

javascript - How to make the variable available in the methods of the class? -

i apologize question, starting larn javascript.

i have 2 methods:

manager.prototype.filters = function () { var user = []; ... manager.prototype.filters_main = function () { var user = []; ...

i need create property 'user' available 2 methods (filters, filters_main). can utilize shared variable (user). how possible write?

you have understand prototype-based inheritance here.

var manager = function() { this.user = []; } var manager = new manager();

these lines define manager constructor function , create new object. when phone call new manager(), happens is:

a new, empty, object created: {}.

the code within constructor run new, empty, object beingness value of this. so, set user property of new object ({}) empty array.

the __proto__ property of new object set value of manager.prototype. so, happens without seeing: manager.__proto__ = manager.prototype.

then, want define new methods on prototype objects, using inheritance. maintain in mind prototype plain js object. not constructor, object. every object created manager function have __proto__ property set the same object.

then, start defining new methods on prototype object, filters function. when you, later, phone call manager.filters(), first own properties filters function , won't find it. so, then, go prototype properties, , there if find it. manager run filters function defined on prototype, using (manager) context, this within function.

so, utilize user property within filters function, have is:

manager.prototype.filters = function () { this.user = ...; } manager.prototype.filters_main = function () { this.user = ...; }

and you'll manipulating same user property defined when object constructed.

javascript