sealocal · July 5, 2018 19:16 · Jul 5, 2018
diff --git a/oop-private-methods.js b/oop-private-methods.js
@@ -0,0 +1,59 @@
+'use strict'
+
+function Car(make, model, year) {
+  // public variables
+  this.make = make;
+  this.model = model;
+  this.year = year;
+  this.breakPedalIsPressed = false;
+
+  // private variable
+  var engineStartAttempts = 0;
+
+  this.startEngine = function() {
+    if (checkStartEngineRequirements()) {
+      console.log('Engine started!')
+      return true;
+    } else { // failed requirements
+      console.log('Engine start failed!')
+      return false
+    }
+  }
+
+  // public method, accesses public variable
+  this.pressBreakPedal = function() {
+    this.breakPedalIsPressed = true;
+  }
+
+  // public method, accesses public variable
+  this.releaseBreakPedal = function() {
+    this.breakPedalIsPressed = false;
+  }
+
+  // private methods
+    var thisCar = this;
+
+    // private method, accesses private variable
+    var checkStartEngineRequirements = function() {
+      console.log('engineStartAttempts: ', ++engineStartAttempts)
+      return ensureBreakPedalIsPressed();
+    }
+
+    // private method, accesses public variable
+    var ensureBreakPedalIsPressed = function() {
+      thisCar.breakPedalIsPressed ? true : console.log('Break pedal is not pressed.')
+      return thisCar.breakPedalIsPressed;
+    }
+}
+
+let car = new Car('Tesla', 'Model 4', 2021);
+
+console.log('\n')
+
+// start the car with a failed start, then a success start.
+console.log(car.startEngine())
+console.log(car.pressBreakPedal())
+console.log(car.startEngine())
+console.log(car.releaseBreakPedal())
+
+console.log('\n')