Lesson 1 - constructors, prototypes and inheritance

src/index.js

@@ -24,3 +24,71 @@ export function doubleEach ( arr ) {
   return result;
 }
 
+// start simple
+
+//export function triple (x) {
+//    return x * 3;
+//}
+//
+//export function tripleEach (arr) {
+//    let result = arr.map (triple);
+//    return result;
+//}
+
+// lesson 1 - activity make Animal work.  Constructors and Prototypes
+// what I did:
+//
+//export function Animal ( animal,speak ) {
+//    this.speak = function(){
+//        return "generic sound";
+//    }
+//    
+//}
+
+export function Animal (){
+}
+
+Animal.prototype.speak = function(){
+    return 'generic sound';
+}
+
+// create new constructors with prototypes that inherit from Animal Reptile and Primate.  Overwrite the speak method for each.
+
+export function Reptile(){
+//    let SOUND = 'hiss';
+}
+
+Reptile.prototype = new Animal(); // inherit Animal properties if you get created
+Reptile.prototype.constructor = Reptile; // Make a valid reptile which is a new animal
+Reptile.SOUND = 'hissss';
+// you can create a function same as parent 
+
+Reptile.prototype.speak = function(){
+    return Reptile.SOUND;
+}
+
+export function Primate(){
+    }
+
+Primate.prototype = new Animal();
+Primate.prototype.constructor = Primate;
+Primate.SOUND = "bongos";
+
+Primate.prototype.speak = function (){
+    return Primate.SOUND;
+}
+
+
+// Create a human
+
+export function Human(){
+
+}
+
+Human.prototype = new Primate();
+Human.prototype.constructor = Human;
+Human.message = 'hello';
+
+Human.prototype.speak = function(){
+    return Human.message;
+}

src/spec.js

@@ -1,5 +1,5 @@
 import test from 'tape';
-import { double, doubleXTimes, doubleEach } from './index';
+import { double, doubleXTimes, doubleEach, tripleEach, Animal, Reptile, Primate, Human } from './index';
 
 test( 'double fn', function ( test ) {
   const actual = double( 5 );
@@ -28,3 +28,83 @@ test( 'doubleEach', function ( test ) {
   test.end();
 });
 
+// just checking if I can 'copy paste'!
+//
+//test ( 'tripleEach', function ( test ) {
+//    const actual = tripleEach([1, 3 ,6]);
+//    const expected = [3, 9, 18];
+//    
+//    test.deepEqual( actual, expected, 'should triple each in the array');
+//    
+//    test.end();
+//});
+
+// lesson 1 activity - try and make test pass.
+
+test ( 'Animal', function ( test ) {
+    const animal = new Animal (); // constructor
+
+    test.ok( animal instanceof Animal, 'should create an instance of Animal');
+
+//    console.log(animal);
+
+    test.end();
+});
+
+test ('Animal', function (test) {
+    const animal = new Animal ();
+    const expected = 'generic sound';
+    const actual = animal.speak();
+
+    test.equal( actual, expected, 'should make a generic sound when it speaks');
+
+    test.end();
+});
+
+
+
+// inheritance
+//
+//
+
+test ('Inheritance', function (test) {
+    let actual, expected;
+
+
+    const reptile = new Reptile();
+
+    test.ok( reptile instanceof Reptile, 'should be an instance of Reptile' );
+    test.ok( reptile instanceof Animal, 'should be an instance of Animal' );
+
+    expected = Reptile.SOUND;
+    actual = reptile.speak();
+    test.equal( actual, expected, 'should make a reptile sound when it speaks' );
+
+    const primate = new Primate();
+
+    test.ok( primate instanceof Primate, 'should be an instance of Primate' );
+    test.ok( primate instanceof Animal, 'should be an instance of Animal' );
+
+    expected = Primate.SOUND;
+    actual = primate.speak();
+    test.equal( actual, expected, 'should make a primate sound when it speaks' );
+    test.end();
+});
+
+test ('Inheritance Human', function (test){
+
+    let actual, expected;
+
+    const human = new Human();
+
+    test.ok( human instanceof Human, 'should be an instance of Human' );
+    test.ok( human instanceof Primate, 'should be an instance of Primate' );
+    test.ok( human instanceof Animal, 'should be an instance of Animal' );
+
+    const message = 'hello';
+    expected = message;
+    actual = human.speak( message );
+    test.equal( actual, expected, 'should speak what it is asked to speak' );
+
+    test.end()
+});