Javascript Objects

js_objects.js

/**
 * Public Javascript Object
 */
function Shape(sides, fillColor, strokeColor) {
  // Public properties
  this.sides = sides;
  this.fillColor = fillColor;
  this.strokeColor = strokeColor;
    
  // Private properties
  var angle = 0;
  
  // Private methods
  function doRotate(newAngle) {
    angle = newAngle;
  }

  // Privileged methods
  this.rotate = function(degrees) {
    var newAngle = angle + degrees;
    doRotate(newAngle);
  };
    
  this.getAngle = function() {
      return angle;
  };
}

// Public method
Shape.prototype.drawShape = function() {
  console.log('I am a shape with ' + this.sides + ' sides.');
  console.log('  I have an angle of ' + this.getAngle() + ' degrees.');
};


// Test
var myShape = new Shape(3, 'red', 'black');
myShape.rotate(45);
myShape.drawShape(); // Ouputs 3 sides and 45 degrees
console.log('Test access private property: ' + myShape.angle);          // Undefined
console.log('Test access priviledged method: ' + myShape.getAngle());   // 45
myShape.sides = 5;
myShape.drawShape(); // Outputs 5 sides and 45 degrees