7/7 You deserved it. failed to define applyStaffDiscount


#1

`function StaffMember(name,discountPercent){
this.name = name;
this.discountPercent = discountPercent;
}

var sally = new StaffMember("Sally",5);
var bob = new StaffMember("Bob",10);

// Create yourself again as 'me' with a staff discount of 20%
var me = new StaffMember("Anthony", 20);

var cashRegister = {
total:0,
lastTransactionAmount: 0,
add: function(itemCost){
this.total += (itemCost || 0);
this.lastTransactionAmount = itemCost;
},

applyStaffDiscount:  function(employee) {
    this.total-= this.total *(employee.discountPercent / 100);
},
scan: function(item,quantity){
    switch (item){
    case "eggs": this.add(0.98 * quantity); break;
    case "milk": this.add(1.23 * quantity); break;
    case "magazine": this.add(4.99 * quantity); break;
    case "chocolate": this.add(0.45 * quantity); break;
    }
    return true;
},
voidLastTransaction : function(){
    this.total -= this.lastTransactionAmount;
    this.lastTransactionAmount = 0;
},

};

cashRegister.scan('eggs',1);
cashRegister.scan('milk',1);
cashRegister.scan('magazine',3);
// Apply your staff discount by passing the 'me' object
// to applyStaffDiscount
applyStaffDiscount(me);

// Show the total bill
console.log('Your bill is '+cashRegister.total.toFixed(2));`

I'm at a loss here, I keep seeing "failed to define applyStaffDiscount" but I see on line 21 that I did define it. Please help


#2

@netpro77448,

The applyStaffDiscount Method is a property of the cashRegister object
so if you want to access the Method
use

cashRegister.applyStaffDiscount( me );

#3

@netpro77448,

- - - B a s i c s - - -

Each Object has one or more properties.
Each property consists of a property-key and it’s associated value.

 var object1 = {
              name: "First"
              }

So object1 has 1 property
a name property with property-key name and it’s associated string VALUE “FIRST”

OR

var myObj = {
         type: 'fancy',
         disposition: 'sunny'
        }

myObj has 2 properties seperated by a comma-,,
a type property with property-key type and an associated string VALUE 'fancy’
a disposition-property with property-key disposition and
…an associated string VALUE ‘sunny’.

= = = = = = = = = = = = = = = = = = = = = = =

To create an Object,
#you can use the literal notation,
you directly create an Instance of the object, with the
properties being separated by a comma-,

  var myObj = {
        type: 'fancy',
        disposition: 'sunny' 
  };

OR
#You create an Object by the construct notation.
First you create an empty Object by way of either
myObj = new Object(); or myObj = {};
and then you attach its properties using the syntax
object-name.property-key = it’s-associated-value ;
( this.name = x ; )

thus:

  var myObj = {};
      myObj.type = 'fancy';
      myObj.disposition = 'sunny'; 

OR
#There is also the facility Class construct notation.
The name should then start with a Capital-letter.

  var Person = function( theName, theAge ) {
         this.name = theName;
         this.age = theAge;
         this.displayInstance = function() {
           console.log("The displayInstance -output-"+
                       "\n============================" +
                     "\n\t name: " + this.name +
                     "\n\t age: " + this.age);
                       };
       };
    //now create an Instance of this Class-object
  var myObj = new Person("Classy_Rocker",20);
    //call the Method displayInstance which takes NO parameters
  myObj.displayInstance();
  console.log( myObj );

you can run this in labs repl.it try it !!

As you can see i created a function within this constructor,
they now call this function a Method.
So if in near future the course is asking you to create a method you now know
that you have to create
a property-key with an associated value being a function within an Object.

nice to know

You could test in labs repl.it
choose Javascript
You will get a split-screen
In the left-hand-side you paste-in your code
click on the Run button.
The right-hand-side is the console

references

www.crockford.com --> for most respected guide-line in Javascript
like coding convention
www.crockford.com
http://javascript.crockford.com/code.html
http://javascript.crockford.com/survey.html

google search
== the Book ==
jquery [your question] site:developer.mozilla.org
CSS [your question] site:developer.mozilla.org
javascript [your question] site:developer.mozilla.org
[your question] site:jquery.com
[your question] site:getbootstrap.com

== discussions / opinions ==
jquery [your question] site:stackoverflow.com
CSS [your question] site:stackoverflow.com
javascript [your question] site:stackoverflow.com

== guidance ==
www.crockford.com
[your question] site:crockford.com

http://stackoverflow.com/questions/1795438/load-and-execution-sequence-of-a-web-page
http://www.w3schools.com/jquery/trysel.asp


#4

I still don’t understand why the parameter employee knows to access StaffMember… Could someone explain?