Adding chapter 12 code

Author: stimms

Chapter 12/traceur1.js

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+class BaseStructure {
+  constructor() {
+      console.log("Structure built");
+  }
+}
+
+class Castle extends BaseStructure {
+ constructor(name){
+  this.name = name;
+  super();
+  }
+ Build(){
+  console.log("Castle built: " + this.name);
+ }
+}

Chapter 12/traceur1.out.js

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+var BaseStructure = function BaseStructure() {
+  "use strict";
+  console.log("Structure built");
+};
+($traceurRuntime.createClass)(BaseStructure, {}, {});
+var Castle = function Castle(name) {
+  "use strict";
+  this.name = name;
+  $traceurRuntime.superCall(this, $Castle.prototype, "constructor", []);
+};
+var $Castle = Castle;
+($traceurRuntime.createClass)(Castle, {Build: function() {
+    "use strict";
+    console.log("Castle built: " + this.name);
+  }}, {}, BaseStructure);

Chapter 12/traceur2.js

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+function CreateFeast(meat, drink = "wine"){
+	console.log("The meat is: " + meat);
+	console.log("The drink is: " + drink);
+}
+CreateFeast("Boar", "Beer"); 
+CreateFeast("Venison");

Chapter 12/traceur2.out.js

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+function CreateFeast(meat) {
+  var drink = arguments[1] !== (void 0) ? arguments[1] : "wine";
+  console.log("The meat is: " + meat);
+  console.log("The drink is: " + drink);
+}
+CreateFeast("Boar", "Beer");
+CreateFeast("Venison");

Chapter 12/traceur3.js

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+var army1Size = 5000;
+var army2Size = 3578;
+console.log(`The surviving army will be ${army1Size > army2Size ? "Army 1": "Army 2"}`);

Chapter 12/traceur3.out.js

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+var army1Size = 5000;
+var army2Size = 3578;
+console.log(("The surviving army will be " + (army1Size > army2Size ? "Army 1" : "Army 2")));

Chapter 12/traceur4.js

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+if(true)
+{
+	var outside = 9;
+	let inside = 7;
+}
+
+console.log(outside);
+console.log(inside);

Chapter 12/traceur4.out.js

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+var inside$__0;
+if (true) {
+  var outside = 9;
+  inside$__0 = 7;
+}
+console.log(outside);
+console.log(inside);

Chapter 12/traceur5.js

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+function timeout(ms) {
+  return new Promise((resolve) => {
+    setTimeout(resolve, ms);
+  });
+}
+
+async function asyncValue(value) {
+  await timeout(1500);
+  return value;
+}
+
+(async function() {
+  console.log("Starting.");
+  var valuePromise =  asyncValue(42).catch(console.error.bind(console));
+  console.log("Task is running in the background.");
+  console.log("Awaiting the promise.");
+  var value = await valuePromise;
+  console.log("Promise resolved.");
+  assert.equal(42, value);
+  console.log(value);
+  done();
+})();

Chapter 12/traceur5.out.js

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+function timeout(ms) {
+  return new Promise((function(resolve) {
+    setTimeout(resolve, ms);
+  }));
+}
+function asyncValue(value) {
+  return $traceurRuntime.asyncWrap(function($ctx) {
+    while (true)
+      switch ($ctx.state) {
+        case 0:
+          Promise.resolve(timeout(1500)).then($ctx.createCallback(3), $ctx.errback);
+          return;
+        case 3:
+          $ctx.returnValue = value;
+          $ctx.state = 5;
+          break;
+        case 5:
+          $ctx.state = -2;
+          break;
+        default:
+          return $ctx.end();
+      }
+  }, this);
+}
+(function() {
+  var valuePromise,
+      value;
+  return $traceurRuntime.asyncWrap(function($ctx) {
+    while (true)
+      switch ($ctx.state) {
+        case 0:
+          console.log("Starting.");
+          valuePromise = asyncValue(42).catch(console.error.bind(console));
+          console.log("Task is running in the background.");
+          console.log("Awaiting the promise.");
+          $ctx.state = 5;
+          break;
+        case 5:
+          Promise.resolve(valuePromise).then($ctx.createCallback(2), $ctx.errback);
+          return;
+        case 2:
+          value = $ctx.value;
+          $ctx.state = 3;
+          break;
+        case 3:
+          console.log("Promise resolved.");
+          assert.equal(42, value);
+          console.log(value);
+          done();
+          $ctx.state = -2;
+          break;
+        default:
+          return $ctx.end();
+      }
+  }, this);
+})();