Complete AboutApplyingWhatWeHaveLearnt.js

kylecho · kylecho · commit 37a796e375c8 · 2015-06-26T21:57:50.000-07:00
diff --git a/koans/AboutApplyingWhatWeHaveLearnt.js b/koans/AboutApplyingWhatWeHaveLearnt.js
@@ -32,16 +32,18 @@ describe("About Applying What We Have Learnt", function() {
         }
     }
 
-    expect(productsICanEat.length).toBe(FILL_ME_IN);
+    expect(productsICanEat.length).toBe(1);
   });
 
   it("given I'm allergic to nuts and hate mushrooms, it should find a pizza I can eat (functional)", function () {
 
       var productsICanEat = [];
 
       /* solve using filter() & all() / any() */
+      productsICanEat = products.filter(function(x){ return x.containsNuts === false; })
+                        .filter(function(y){ return y.ingredients.indexOf('mushrooms') === -1 });
 
-      expect(productsICanEat.length).toBe(FILL_ME_IN);
+      expect(productsICanEat.length).toBe(1);
   });
 
   /*********************************************************************************/
@@ -55,14 +57,21 @@ describe("About Applying What We Have Learnt", function() {
       }
     }
     
-    expect(sum).toBe(FILL_ME_IN);
+    expect(sum).toBe(233168);
   });
 
   it("should add all the natural numbers below 1000 that are multiples of 3 or 5 (functional)", function () {
 
-    var sum = FILL_ME_IN;    /* try chaining range() and reduce() */
+    var sum = _.range(1, 1000)
+               .reduce(function(memo, elem){
+                 if (elem % 3 === 0 || elem % 5 === 0) {
+                   return memo + elem;
+                 } else {
+                   return memo;
+                 }
+               }, 0);    /* try chaining range() and reduce() */
 
-    expect(233168).toBe(FILL_ME_IN);
+    expect(233168).toBe(sum);
   });
 
   /*********************************************************************************/
@@ -75,15 +84,29 @@ describe("About Applying What We Have Learnt", function() {
         }
     }
 
-    expect(ingredientCount['mushrooms']).toBe(FILL_ME_IN);
+    expect(ingredientCount['mushrooms']).toBe(2);
   });
 
   it("should count the ingredient occurrence (functional)", function () {
     var ingredientCount = { "{ingredient name}": 0 };
 
     /* chain() together map(), flatten() and reduce() */
 
-    expect(ingredientCount['mushrooms']).toBe(FILL_ME_IN);
+    _.chain(products)
+    .map(function(product){
+      return product.ingredients;
+    })
+    .flatten()
+    .reduce(function(memo, elem){
+        if (elem === 'mushrooms') {
+          ingredientCount['mushrooms'] = (ingredientCount['mushrooms'] || 0 ) + 1;
+        } else {
+          return;
+        }
+      })
+    .value();
+
+    expect(ingredientCount['mushrooms']).toBe(2);
   });
 
   /*********************************************************************************/
