'slds button event source getting error aura component

I need help in getting the button attribute value in the controller.js file from .cmp file as below:

//MyButton.cmp file

<aura:iteration items="{options}" var="option">
  <button onclick="{!c.getValue}" value="{!option}"></button
</aura:iteration>

//MyButtonController.js

getValue:function(cmp,event,helper){
var optionValue = event.getSource().get("v.value");//breaking coode here..

}

Can anyone please help me to get value?

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