How To Find Button Click Using Lightning Component

Requirement:

 On LC there are two buttons. Both buttons have same function how to get which button have clicked.

 Solution
Create a component ButtonClick.cmp

 <!--c:ButtonClicked->
<aura:component >
    <aura:attribute name="whichButton" type="String" />
    
    <p>You clicked: {!v.whichButton}</p>

     <ui:button aura:id="button1" label="Click me" press="{!c.pressMe}"/>
    <ui:button aura:id="button2" label="Click me too" press="{!c.pressMe}"/>

</aura:component>
/* ButtonClickedController.js */
({
    pressMe: function(cmp, event, helper) {
        var whichOne = event.getSource().getLocalId();
        console.log(whichOne);
        cmp.set("v.whichButton", whichOne);
    }

})

Create a app Test.app for Testing

 <aura:application extends="force:slds">
   
     <c:ButtonClicked/>
<!-- here c: is org. namespace prefix-->

</aura:application>

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