APIs available in $A top-level functions

The Aura object is the top-level object in the JavaScript framework code. In this section, we will explore some of the utility functions that the Lightning component framework supports. To explore all of the supported JavaScript functions and APIs of the Lightning component framework, refer to the documentation in your Salesforce instance at https://<myDomain>.Lightning.force.com/auradocs/reference.app#reference, where myDomain is the custom domain set for the application.

Exploring the $A.Util APIs

The following table shows supported Util functions:

Util Class	Description	Example Code
addClass (Object elementString newClass)	Adds a CSS class to a component.	var myCmp = component.find("myCmp"); $A.util.addClass(myCmp, "myClass");
getBooleanValue (object val): Boolean	Coerces truthy and falsy values into native Booleans.
hasClass (Object elementStringclassName): Boolean	Checks whether the component has the specified CSS class.	//find a component with aura...