Learning Object-Oriented Programming

Working with constructor functions in JavaScript

The following lines of code create an object named myObject without any specific properties or methods. This line checks the type of the variable (myObject) and then prints the key-value pairs that define the object on the JavaScript console:

var myObject = {};
typeof(myObject);
myObject

The preceding lines created an empty object. Therefore, the result of the last line shows Object {} on the console. There are no properties or methods defined in the object. However, if we enter myObject. (myObject followed by a dot) in a JavaScript console with autocomplete features, we will see many properties and methods listed, as shown in the following screenshot. The object includes many built-in properties ...