Adv. JS Mini complete

app.js

@@ -1,39 +1,67 @@
 /* The four rules for 'this';
 * in your own words. explain the four rules for the "this" keyword below.
-* 1. 
-* 2. 
-* 3. 
-* 4. 
+* 1. Globally scoped funtions => 'This' = the Window object
+* 2. Chained function calls => 'This' = whatever is returned preceding the dot
+* 3. Contructor Functions & Classes => 'This' = the specific instance of the object returned
+* 4. Function Call, Apply, or Bind => 'This' = whatever is explicitly defined in the arguments
 * write out a code example of each explanation above
 */
 
 // First Rule
-
+let globalThis = this;
+console.log(globalThis);
 // Second Rule
-
+function thisFunction() {
+  this.className = 'thisClass',
+  this.classPurpose = 'an example of what this means'
+  this.showMeThis = function() {
+    console.log(this)
+  }
+}
+const thisFunctionExample = new thisFunction()
+thisFunctionExample.showMeThis(); // this = thisFunctionExample
 // Third Rule
-
+class thisClass {
+  constructor(options) {
+    this.classNickname = options.classNickname;
+  }
+  showMeThis() {
+    console.log(this);
+  }
+}
+const thisClassExample = new thisClass({classNickname: 'exemplaryExample'});
+thisClassExample.showMeThis();
 // Fourth Rule * you may want to use your third rule's example to accomplish this
+const options = {
+  functionNickname: 'Bound to be another exemplary example'
+}
+function aFunction() {
+  console.log(this.functionNickname);
+}
+const boundFunction = aFunction.bind(options);
+boundFunction()
 
 // explain closure 
+// A function that has access to a variable defined in its parent function
 
 function foo () {
-  console.log(this); // what does this point to?
+  console.log(this); // what does this point to? === Global this (Window)
 };
 
 const counterFunction = () => {
-  // this code is broken. figure out why, and tell us where the closure is when you fix it
-  const changeCount = (value) => {
-    count += value;
-  };
+  // this code is broken. figure out why, and tell us where the closure is when you fix it  
+  let count = 0; // <== Here be the fix
+  const changeCount = (value) => { 
+    count += value; // <== Here be the closure
+  }; 
   return {
     increment: () => {
       changeCount(1);
     },
     decrement: () => {
       changeCount(-1);
     },
-    total: () => {
+    total: () => { 
       return count;
     }
   }
@@ -48,21 +76,40 @@ console.log(counter.total());
 
 
 // create a constructor function called "Car"
-  // car takes an options object as its only argument
+// car takes an options object as its only argument
+function Car(options) {
   // your options object should have "make", "model", "year" properties on it
   // assign these properties you pass in with options to the constructors 'this' object.
+  this.make = options.make;
+  this.model = options.model;
+  this.year = options.year;
   // add a speak() method to your object that when called will log out the car's make model and year.
+  this.speak = function() {
+    return `Make: ${this.make}, Model: ${this.model}, Year: ${this.year}`
+  }
+}
 
 // when you're done un comment the next few lines and run the file here in node `node app.js`.
 
-// const herby = new Car({make: 'Volkswagen', model: 'Beetle', year: '1963'});
-// console.log(herby.speak());
-// const goldfinger = new Car({make: 'Aston Martin', model: 'DB5', year: '1964'});
-// console.log(goldfinger.speak());
+const herby = new Car({make: 'Volkswagen', model: 'Beetle', year: '1963'});
+console.log(herby.speak());
+const goldfinger = new Car({make: 'Aston Martin', model: 'DB5', year: '1964'});
+console.log(goldfinger.speak());
 
 
 // once you get done with this, redo it all using the class keyword and a constructor function. 
 
+// class Car {
+//   constructor(options) {
+//     this.make = options.make;
+//     this.model = options.model;
+//     this.year = options.year;
+//   }
+//   sayHi() {
+//     return this;
+//   }
+// }
+
 // extra credit
 
 // we didn't touch on Recursion in the lecture yet, but you're going to build a recursive function now
@@ -75,7 +122,12 @@ while(n >= 1) {
 }
 // write a function called countDown that does the exact same thing as above, but calls itself until it can't anymore.
   // hint-> your base case will look like the logic in the while loop.
+const countDown = (n) => {
+  console.log(n)
+  if (n > 1) countDown(n - 1)
+}
 
+countDown(5)