# 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. ~~~