CODEWITHSUNDEEP
javascriptprototype
Arnold
Arnold

Reputation: 210

how can i call a javascript function in another function?

this is my class

function User(){
     this.nickname='nickname';
}
User.prototype.save=function(){
     dosomething();
};
User.prototype.add=function(){
     dosometing();
     call save();
};

i want to call the save() function in the add() function,but i don't know how to do.I tried 

User.prototype.add=function(){
     save();
};

and User.prototype.add=function(){ User.prototype.save(); };

but both are wrong,and what should i do?

Upvotes: 1

Views: 94

Answers (2)

HIRA THAKUR
HIRA THAKUR

Reputation: 17757

Ok.There are a few mistakes in your code.

Here we are using the classical model of inheritance.

Step 1.Create a constructor function. eg. function user(){...}

Step 2.Extend your prototype by adding methods.eg add,save etc

step 3.Create an instance to call methods.eg.MyInstance

  function User(){
         this.nickname='nickname';
    }

    User.prototype.dosomething=function(){
        //some code
    };

    User.prototype.save=function(){
         this.dosomething();
    };
    User.prototype.add=function(){
         this.dosometing();
         this.save();
    };

Now lets say I want to call a method add.This is how its done.

var MyInstance = new User();//create an instance.

MyInstance.add();//call the function.

Outside the scope of your question : The same thing could be done by Prototypal Inheritance as well.

     var UserPrototype={

     save:function(){..},
     add:function(){
         this.save();  
         }
      }

     var MyInstance = Object.Create(UserPrototype);
     MyInstance.add();

Upvotes: 3

Jackson Ray Hamilton
Jackson Ray Hamilton

Reputation: 9486

function User() {
  this.nickname = 'nickname';
}
// ...
User.prototype.add = function() {
  this.save();
};

You were not defining your User constructor properly.

Also, instances of User (created like var myUser = new User(); ) can access their prototype's methods via this.methodNameHere();

Upvotes: 4

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