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How to call Lightning Component JS controller call one method from other method without helper

Is there a way to call one method from other method without helper in lightning component JS controller.
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I think helper is the best way to do. But If you want to use a existing contoller method without changing anything the below link has a detailed description :

https://salesforceblog.tumblr.com/post/178881975383/how-to-call-lightning-component-js-controller-call