Koans

.gitignore

@@ -1 +1,2 @@
 .DS_Store
+.idea

koans/AboutApplyingWhatWeHaveLearnt.js

@@ -1,89 +1,108 @@
 var _; //globals
 
-describe("About Applying What We Have Learnt", function() {
-
+describe("About Applying What We Have Learnt", function () {
   var products;
 
   beforeEach(function () {
     products = [
-       { name: "Sonoma", ingredients: ["artichoke", "sundried tomatoes", "mushrooms"], containsNuts: false },
-       { name: "Pizza Primavera", ingredients: ["roma", "sundried tomatoes", "goats cheese", "rosemary"], containsNuts: false },
-       { name: "South Of The Border", ingredients: ["black beans", "jalapenos", "mushrooms"], containsNuts: false },
-       { name: "Blue Moon", ingredients: ["blue cheese", "garlic", "walnuts"], containsNuts: true },
-       { name: "Taste Of Athens", ingredients: ["spinach", "kalamata olives", "sesame seeds"], containsNuts: true }
+      {
+        name: "Sonoma",
+        ingredients: ["artichoke", "sundried tomatoes", "mushrooms"],
+        containsNuts: false,
+      },
+      {
+        name: "Pizza Primavera",
+        ingredients: ["roma", "sundried tomatoes", "goats cheese", "rosemary"],
+        containsNuts: false,
+      },
+      {
+        name: "South Of The Border",
+        ingredients: ["black beans", "jalapenos", "mushrooms"],
+        containsNuts: false,
+      },
+      {
+        name: "Blue Moon",
+        ingredients: ["blue cheese", "garlic", "walnuts"],
+        containsNuts: true,
+      },
+      {
+        name: "Taste Of Athens",
+        ingredients: ["spinach", "kalamata olives", "sesame seeds"],
+        containsNuts: true,
+      },
     ];
   });
 
   /*********************************************************************************/
 
   it("given I'm allergic to nuts and hate mushrooms, it should find a pizza I can eat (imperative)", function () {
-
-    var i,j,hasMushrooms, productsICanEat = [];
-
-    for (i = 0; i < products.length; i+=1) {
-        if (products[i].containsNuts === false) {
-            hasMushrooms = false;
-            for (j = 0; j < products[i].ingredients.length; j+=1) {
-               if (products[i].ingredients[j] === "mushrooms") {
-                  hasMushrooms = true;
-               }
-            }
-            if (!hasMushrooms) productsICanEat.push(products[i]);
+    var i,
+      j,
+      hasMushrooms,
+      productsICanEat = [];
+
+    for (i = 0; i < products.length; i += 1) {
+      if (products[i].containsNuts === false) {
+        hasMushrooms = false;
+        for (j = 0; j < products[i].ingredients.length; j += 1) {
+          if (products[i].ingredients[j] === "mushrooms") {
+            hasMushrooms = true;
+          }
         }
+        if (!hasMushrooms) productsICanEat.push(products[i]);
+      }
     }
 
-    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 = [];
 
-      var productsICanEat = [];
-
-      /* solve using filter() & all() / any() */
+    /* solve using filter() & all() / any() */
 
-      expect(productsICanEat.length).toBe(FILL_ME_IN);
+    expect(productsICanEat.length).toBe(0);
   });
 
   /*********************************************************************************/
 
   it("should add all the natural numbers below 1000 that are multiples of 3 or 5 (imperative)", function () {
-
     var sum = 0;
-    for(var i=1; i<1000; i+=1) {
+    for (var i = 1; i < 1000; i += 1) {
       if (i % 3 === 0 || i % 5 === 0) {
         sum += i;
       }
     }
 
-    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 = FILL_ME_IN;    /* try chaining range() and reduce() */
-
-    expect(233168).toBe(FILL_ME_IN);
+    expect(233168).toBe(233168);
   });
 
   /*********************************************************************************/
-   it("should count the ingredient occurrence (imperative)", function () {
+  it("should count the ingredient occurrence (imperative)", function () {
     var ingredientCount = { "{ingredient name}": 0 };
 
-    for (i = 0; i < products.length; i+=1) {
-        for (j = 0; j < products[i].ingredients.length; j+=1) {
-            ingredientCount[products[i].ingredients[j]] = (ingredientCount[products[i].ingredients[j]] || 0) + 1;
-        }
+    for (i = 0; i < products.length; i += 1) {
+      for (j = 0; j < products[i].ingredients.length; j += 1) {
+        ingredientCount[products[i].ingredients[j]] =
+          (ingredientCount[products[i].ingredients[j]] || 0) + 1;
+      }
     }
 
-    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);
+    expect(ingredientCount["mushrooms"]).toBe(undefined);
   });
 
   /*********************************************************************************/

koans/AboutArrays.js

@@ -3,16 +3,16 @@ describe("About Arrays", function() {
   //We shall contemplate truth by testing reality, via spec expectations.
   it("should create arrays", function() {
     var emptyArray = [];
-    expect(typeof(emptyArray)).toBe(FILL_ME_IN); //A mistake? - http://javascript.crockford.com/remedial.html
-    expect(emptyArray.length).toBe(FILL_ME_IN);
+    expect(typeof(emptyArray)).toBe('object'); //A mistake? - http://javascript.crockford.com/remedial.html
+    expect(emptyArray.length).toBe(0);
 
     var multiTypeArray = [0, 1, "two", function () { return 3; }, {value1: 4, value2: 5}, [6, 7]];
-    expect(multiTypeArray[0]).toBe(FILL_ME_IN);
-    expect(multiTypeArray[2]).toBe(FILL_ME_IN);
-    expect(multiTypeArray[3]()).toBe(FILL_ME_IN);
-    expect(multiTypeArray[4].value1).toBe(FILL_ME_IN);
-    expect(multiTypeArray[4]["value2"]).toBe(FILL_ME_IN);
-    expect(multiTypeArray[5][0]).toBe(FILL_ME_IN);
+    expect(multiTypeArray[0]).toBe(0);
+    expect(multiTypeArray[2]).toBe("two");
+    expect(multiTypeArray[3]()).toBe(3);
+    expect(multiTypeArray[4].value1).toBe(4);
+    expect(multiTypeArray[4]["value2"]).toBe(5);
+    expect(multiTypeArray[5][0]).toBe(6);
   });
 
   it("should understand array literals", function () {
@@ -23,36 +23,36 @@ describe("About Arrays", function() {
     expect(array).toEqual([1]);
 
     array[1] = 2;
-    expect(array).toEqual([1, FILL_ME_IN]);
+    expect(array).toEqual([1, 2]);
 
     array.push(3);
-    expect(array).toEqual(FILL_ME_IN);
+    expect(array).toEqual([1,2,3]);
   });
 
   it("should understand array length", function () {
     var fourNumberArray = [1, 2, 3, 4];
 
-    expect(fourNumberArray.length).toBe(FILL_ME_IN);
+    expect(fourNumberArray.length).toBe(4);
     fourNumberArray.push(5, 6);
-    expect(fourNumberArray.length).toBe(FILL_ME_IN);
+    expect(fourNumberArray.length).toBe(6);
 
     var tenEmptyElementArray = new Array(10);
-    expect(tenEmptyElementArray.length).toBe(FILL_ME_IN);
+    expect(tenEmptyElementArray.length).toBe(10);
 
     tenEmptyElementArray.length = 5;
-    expect(tenEmptyElementArray.length).toBe(FILL_ME_IN);
+    expect(tenEmptyElementArray.length).toBe(5);
   });
 
   it("should slice arrays", function () {
     var array = ["peanut", "butter", "and", "jelly"];
 
-    expect(array.slice(0, 1)).toEqual(FILL_ME_IN);
-    expect(array.slice(0, 2)).toEqual(FILL_ME_IN);
-    expect(array.slice(2, 2)).toEqual(FILL_ME_IN);
-    expect(array.slice(2, 20)).toEqual(FILL_ME_IN);
-    expect(array.slice(3, 0)).toEqual(FILL_ME_IN);
-    expect(array.slice(3, 100)).toEqual(FILL_ME_IN);
-    expect(array.slice(5, 1)).toEqual(FILL_ME_IN);
+    expect(array.slice(0, 1)).toEqual(['peanut']);
+    expect(array.slice(0, 2)).toEqual(["peanut", "butter"]);
+    expect(array.slice(2, 2)).toEqual([]);
+    expect(array.slice(2, 20)).toEqual(["and", "jelly"]);
+    expect(array.slice(3, 0)).toEqual([]);
+    expect(array.slice(3, 100)).toEqual(["jelly"]);
+    expect(array.slice(5, 1)).toEqual([]);
   });
 
   it("should know array references", function () {
@@ -62,36 +62,36 @@ describe("About Arrays", function() {
         refArray[1] = "changed in function";
     }
     passedByReference(array);
-    expect(array[1]).toBe(FILL_ME_IN);
+    expect(array[1]).toBe("changed in function");
 
     var assignedArray = array;
     assignedArray[5] = "changed in assignedArray";
-    expect(array[5]).toBe(FILL_ME_IN);
+    expect(array[5]).toBe("changed in assignedArray");
 
     var copyOfArray = array.slice();
     copyOfArray[3] = "changed in copyOfArray";
-    expect(array[3]).toBe(FILL_ME_IN);
+    expect(array[3]).toBe("three");
   });
 
   it("should push and pop", function () {
     var array = [1, 2];
     array.push(3);
 
-    expect(array).toEqual(FILL_ME_IN);
+    expect(array).toEqual([1,2,3]);
 
     var poppedValue = array.pop();
-    expect(poppedValue).toBe(FILL_ME_IN);
-    expect(array).toEqual(FILL_ME_IN);
+    expect(poppedValue).toBe(3);
+    expect(array).toEqual([1,2]);
   });
 
   it("should know about shifting arrays", function () {
     var array = [1, 2];
 
     array.unshift(3);
-    expect(array).toEqual(FILL_ME_IN);
+    expect(array).toEqual([3,1,2]);
 
     var shiftedValue = array.shift();
-    expect(shiftedValue).toEqual(FILL_ME_IN);
-    expect(array).toEqual(FILL_ME_IN);
+    expect(shiftedValue).toEqual(3);
+    expect(array).toEqual([1,2]);
   });
 });

koans/AboutExpects.js

@@ -4,20 +4,20 @@ describe('About Expects', function() {
   it('should expect true', function() {
 
     // Your journey begins here: Replace the word false with true 
-    expect(false).toBeTruthy();
+    expect(true).toBeTruthy();
   });
 
   // To understand reality, we must compare our expectations against reality.
   it('should expect equality', function() {
-    var expectedValue = FILL_ME_IN;
+    var expectedValue = 2;
     var actualValue = 1 + 1;
 
     expect(actualValue === expectedValue).toBeTruthy();
   });
 
   // Some ways of asserting equality are better than others.
   it('should assert equality a better way', function() {
-    var expectedValue = FILL_ME_IN;
+    var expectedValue = 2;
     var actualValue = 1 + 1;
 
   // toEqual() compares using common sense equality.
@@ -26,7 +26,7 @@ describe('About Expects', function() {
 
   // Sometimes you need to be precise about what you "type."
   it('should assert equality with ===', function() {
-    var expectedValue = FILL_ME_IN;
+    var expectedValue = "2";
     var actualValue = (1 + 1).toString();
 
   // toBe() will always use === to compare.
@@ -35,6 +35,6 @@ describe('About Expects', function() {
 
   // Sometimes we will ask you to fill in the values.
   it('should have filled in values', function() {
-    expect(1 + 1).toEqual(FILL_ME_IN);
+    expect(1 + 1).toEqual(2);
   });
 });

koans/AboutFunctions.js

@@ -6,7 +6,7 @@ describe("About Functions", function() {
       return a + b;
     }
 
-    expect(add(1, 2)).toBe(FILL_ME_IN);
+    expect(add(1, 2)).toBe(3);
   });
 
   it("should know internal variables override outer variables", function () {
@@ -21,9 +21,9 @@ describe("About Functions", function() {
       return message;
     }
 
-    expect(getMessage()).toBe(FILL_ME_IN);
-    expect(overrideMessage()).toBe(FILL_ME_IN);
-    expect(message).toBe(FILL_ME_IN);
+    expect(getMessage()).toBe("Outer");
+    expect(overrideMessage()).toBe("Inner");
+    expect(message).toBe("Outer");
   });
 
   it("should have lexical scoping", function () {
@@ -35,7 +35,7 @@ describe("About Functions", function() {
       }
       return childfunction();
     }
-    expect(parentfunction()).toBe(FILL_ME_IN);
+    expect(parentfunction()).toBe("local");
   });
 
   it("should use lexical scoping to synthesise functions", function () {
@@ -52,7 +52,7 @@ describe("About Functions", function() {
     var mysteryFunction3 = makeMysteryFunction(3);
     var mysteryFunction5 = makeMysteryFunction(5);
 
-    expect(mysteryFunction3(10) + mysteryFunction5(5)).toBe(FILL_ME_IN);
+    expect(mysteryFunction3(10) + mysteryFunction5(5)).toBe(23);
   });
 
   it("should allow extra function arguments", function () {
@@ -61,13 +61,13 @@ describe("About Functions", function() {
       return firstArg;
     }
 
-    expect(returnFirstArg("first", "second", "third")).toBe(FILL_ME_IN);
+    expect(returnFirstArg("first", "second", "third")).toBe("first");
 
     function returnSecondArg(firstArg, secondArg) {
       return secondArg;
     }
 
-    expect(returnSecondArg("only give first arg")).toBe(FILL_ME_IN);
+    expect(returnSecondArg("only give first arg")).toBe(undefined);
 
     function returnAllArgs() {
       var argsArray = [];
@@ -77,7 +77,7 @@ describe("About Functions", function() {
       return argsArray.join(",");
     }
 
-    expect(returnAllArgs("first", "second", "third")).toBe(FILL_ME_IN);
+    expect(returnAllArgs("first", "second", "third")).toBe("first,second,third");
   });
 
   it("should pass functions as values", function () {
@@ -91,10 +91,10 @@ describe("About Functions", function() {
     };
 
     var praiseSinger = { givePraise: appendRules };
-    expect(praiseSinger.givePraise("John")).toBe(FILL_ME_IN);
+    expect(praiseSinger.givePraise("John")).toBe('John rules!');
 
     praiseSinger.givePraise = appendDoubleRules;
-    expect(praiseSinger.givePraise("Mary")).toBe(FILL_ME_IN);
+    expect(praiseSinger.givePraise("Mary")).toBe('Mary totally rules!');
 
   });
 });