Properties

Object"s property is a propertyName: propertyValue pair, where property name can be only a string. If it"s not a string, it gets casted into a string. You can specify properties when creating an object or later. There may be zero or more properties separated by commas.

var language = {
    name: "JavaScript",
    isSupportedByBrowsers: true,
    createdIn: 1995,
    author:{
        firstName: "Brendan",
        lastName: "Eich"
    },
 // Yes, objects can be nested!
    getAuthorFullName: function(){
        return this.author.firstName + " " + this.author.lastName;    
    }
 // Yes, functions can be values too!
};

The following code demonstates how to get a property"s value.

var variable = language.name;
 // variable now contains "JavaScript" string.
    variable = language["name"];
 // The lines above do the same thing. The difference is that the second one lets you use litteraly any string as a property name, but it"s less readable. 
    variable = language.newProperty; 
 // variable is now undefined, because we have not assigned this property yet.

The following example shows how to add a new property or change an existing one.

language.newProperty = "new value";
 // Now the object has a new property. If the property already exists, its value will be replaced.
language["newProperty"] = "changed value";
 // Once again, you can access properties both ways. The first one (dot notation) is recomended.