node.js + CoffeeScript + jasmine

gonzalo123/nodejs/potter.coffee

@@ -0,0 +1,39 @@
+class Potter
+    constructor: () ->
+        @discounts   = [0, 1, 0.95, 0.9, 0.8, 0.75]
+        @basePrice   = 8
+        @_blankBooks = [0, 0, 0, 0, 0]
+
+        @_price = (shopingCart) ->
+            size = @_calcSize shopingCart
+            return 0 if size is 0
+            newBooks = @_changeShoppingCart(shopingCart, size)
+            size * @discounts[size] + @_price(newBooks)
+
+        @_calcSize = (shopingCart) ->
+            size = size2 = 0
+            for bookAmount in shopingCart
+                size++  if bookAmount > 0
+                size2++ if bookAmount > 1
+            if size2 is 3 and size is 5
+                return 4
+            size
+
+        @_changeShoppingCart = (shopingCart, toReduce) ->
+            nextshopingCart = @_blankBooks
+            i = 0
+            for bookAmount in shopingCart
+                nextshopingCart[i] = bookAmount
+                if bookAmount > 0 and toReduce > 0
+                    --toReduce
+                    nextshopingCart[i] = bookAmount - 1
+                i++
+            nextshopingCart
+
+    price: (books) ->
+        shopingCart = @_blankBooks
+        for book in books
+            shopingCart[book]++
+        @basePrice * @_price(shopingCart)
+
+exports.Potter = Potter

gonzalo123/nodejs/spec/potter_spec.coffee

@@ -0,0 +1,31 @@
+Potter = require('../potter').Potter
+potter = new Potter
+
+describe 'jasmine-node', ->
+
+    it 'testBasics', ->
+        expect(potter.price []).toEqual 0
+        expect(potter.price [0]).toEqual 8
+        expect(potter.price [1]).toEqual 8
+        expect(potter.price [2]).toEqual 8
+        expect(potter.price [3]).toEqual 8
+        expect(potter.price [4]).toEqual 8
+
+        expect(potter.price [0, 0]).toEqual 8 * 2
+        expect(potter.price [1, 1, 1]).toEqual 8 * 3
+
+    it 'testSimpleDiscounts', ->
+        expect(potter.price [0, 1]).toEqual 8 * 2 * 0.95
+        expect(potter.price [0, 2, 4]).toEqual 8 * 3 * 0.9
+        expect(potter.price [0, 1, 2, 4]).toEqual 8 * 4 * 0.8
+        expect(potter.price [0, 1, 2, 3, 4]).toEqual 8 * 5 * 0.75
+
+    it 'testSeveralDiscounts', ->
+        expect(potter.price [0, 0, 1]).toEqual 8 + (8 * 2 * 0.95)
+        expect(potter.price [0, 0, 1, 1]).toEqual 2 * (8 * 2 * 0.95)
+        expect(potter.price [0, 0, 1, 2, 2, 3]).toEqual((8 * 4 * 0.8) + (8 * 2 * 0.95))
+        expect(potter.price [0, 1, 1, 2, 3, 4]).toEqual 8 + (8 * 5 * 0.75)
+
+    it 'testEdgeCases', ->
+        expect(potter.price [0, 0, 1, 1, 2, 2, 3, 4]).toEqual 2 * (8 * 4 * 0.8)
+        expect(potter.price [0, 0, 0, 0, 0, 1, 1, 1, 1, 1,2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4]).toEqual(3 * (8 * 5 * 0.75) + 2 * (8 * 4 * 0.8))

gonzalo123/nodejs/spec/potter_spec.js

@@ -0,0 +1,33 @@
+(function() {
+  var Potter, potter;
+  Potter = require('../potter').Potter;
+  potter = new Potter;
+  describe('jasmine-node', function() {
+    it('testBasics', function() {
+      expect(potter.price([])).toEqual(0);
+      expect(potter.price([0])).toEqual(8);
+      expect(potter.price([1])).toEqual(8);
+      expect(potter.price([2])).toEqual(8);
+      expect(potter.price([3])).toEqual(8);
+      expect(potter.price([4])).toEqual(8);
+      expect(potter.price([0, 0])).toEqual(8 * 2);
+      return expect(potter.price([1, 1, 1])).toEqual(8 * 3);
+    });
+    it('testSimpleDiscounts', function() {
+      expect(potter.price([0, 1])).toEqual(8 * 2 * 0.95);
+      expect(potter.price([0, 2, 4])).toEqual(8 * 3 * 0.9);
+      expect(potter.price([0, 1, 2, 4])).toEqual(8 * 4 * 0.8);
+      return expect(potter.price([0, 1, 2, 3, 4])).toEqual(8 * 5 * 0.75);
+    });
+    it('testSeveralDiscounts', function() {
+      expect(potter.price([0, 0, 1])).toEqual(8 + (8 * 2 * 0.95));
+      expect(potter.price([0, 0, 1, 1])).toEqual(2 * (8 * 2 * 0.95));
+      expect(potter.price([0, 0, 1, 2, 2, 3])).toEqual((8 * 4 * 0.8) + (8 * 2 * 0.95));
+      return expect(potter.price([0, 1, 1, 2, 3, 4])).toEqual(8 + (8 * 5 * 0.75));
+    });
+    return it('testEdgeCases', function() {
+      expect(potter.price([0, 0, 1, 1, 2, 2, 3, 4])).toEqual(2 * (8 * 4 * 0.8));
+      return expect(potter.price([0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4])).toEqual(3 * (8 * 5 * 0.75) + 2 * (8 * 4 * 0.8));
+    });
+  });
+}).call(this);