shivshankar3578/wunder-assignment

Classes

Product

Basic product

CartItem

cart item extend product

Promo

Rule processor

Cart

Cart

CartDiscount

Rule discount on cart sub total

ExclusiveDiscount

discount per item

Product

Basic product

Kind: global class

new Product(id, name, price)

create a new product

Param	Type
id	Number
name	String
price	Number

CartItem

cart item extend product

Kind: global class

new CartItem(product, quantity)

create a new cart item

Param	Type
product	Product
quantity	Number

Promo

Rule processor

Kind: global class

• Promo
  • new Promo(...rules)
  • .exclusiveDiscount(item) ⇒ Number
  • .cartDiscount(subTotal) ⇒ Number

new Promo(...rules)

create new promo session

Param	Type
...rules	CartDiscount | ExclusiveDiscount

promo.exclusiveDiscount(item) ⇒ Number

apply exclusive rules for a item

Kind: instance method of Promo

Param	Type
item	CartItem

promo.cartDiscount(subTotal) ⇒ Number

apply cart rules for a sub total

Kind: instance method of Promo

Param	Type
subTotal	Number

Cart

Cart

Kind: global class

• Cart
  • new Cart(promo)
  • .scan(product) ⇒ this
  • .subTotal() ⇒ number
  • .payable() ⇒ Number

new Cart(promo)

create a cart

Param	Type
promo	Promo

cart.scan(product) ⇒ this

scan item

Kind: instance method of Cart

Param	Type
product	Product

cart.subTotal() ⇒ number

cart sub total before cart discount

Kind: instance method of Cart

cart.payable() ⇒ Number

apply cart discount

Kind: instance method of Cart
Returns: Number - - final payable amount

CartDiscount

Rule discount on cart sub total

Kind: global class

• CartDiscount
  • new CartDiscount(min, max, discount, flat)
  • .discount(subTotal) ⇒ Number

new CartDiscount(min, max, discount, flat)

flat discount will be called at the end of all other discounts in case of multiple flat discount higher severity flat discount will be applicable

Param	Type	Description
min	Number	min amount
max	Number	max amount
discount	Number	amount or fraction ration
flat	Boolean	enable discount as amount

Example

    |  Min |  Max  | discount | code                            |  comment |
    |------|-------|----------|---------------------------------|----------|
    | 10$  |  30$  |  10%     |  new CartDiscount(10, 30, 0.1); |          |
    | 30$  | 50$   |  20%     |  new CartDiscount(30, 50, 0.2); |          |
    | 50$  | any   |  8$      |  new CartDiscount(10, 20, 8, 1);|          | 

cartDiscount.discount(subTotal) ⇒ Number

calculate discount on cart sub total

Kind: instance method of CartDiscount
Returns: Number - - discount

Param	Type
subTotal	Cart.total

ExclusiveDiscount

discount per item

Kind: global class

• ExclusiveDiscount
  • new ExclusiveDiscount(pid, quantity, price)
  • .discount(item) ⇒ Number

new ExclusiveDiscount(pid, quantity, price)

discount applicable when ordering certain item quantity

Param	Type
pid	Number
quantity	Number
price	Number

exclusiveDiscount.discount(item) ⇒ Number

calculate discount per items

Kind: instance method of ExclusiveDiscount
Returns: Number - - discount

Param	Type
item	CartItem