How to get Salesforce Lightning event label to controller?

How to get Salesforce Lightning event label to controller?

  1:04 PM    ssaikgame

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The below code is a sample component, is having one attribute for message, and has 2 lightning buttons.
Wants to display the button label on Lighting component.

 <aura:component>  
   <aura:attribute name="message" type="String"/>  
   <p>Message of the day: {!v.message}</p>  
   <div>  
     <lightning:button label="You look nice today."  
       onclick="{!c.handleClick}"/>  
     <lightning:button label="Today is going to be a great day!"  
       onclick="{!c.handleClick}"/>  
   </div>  
 </aura:component>  

Controller:

 ({  
   handleClick: function(component, event, helper) {  
     var btnClicked = event.getSource();     // the button  
     var btnMessage = btnClicked.get("v.label"); // the button's label  
     component.set("v.message", btnMessage);   // update our message  
   }  
 })  

Component Displays:

The below code gets Button

 var btnClicked = event.getSource();     // the button  

The below code gets Button label

 var btnMessage = btnClicked.get("v.label"); // the button's label  

The below code updates the attribute named "message"

 component.set("v.message", btnMessage);   // update our message  

Source: trailhead.salesforce.com