title: Access a prop of Vuex store dynamically
body: <p>Is it possible to enter a Vuex store state with another variable?
  For example:</p>
  <pre><code>export const TestState = {
   state: {
    data: {
     test: {
      value: 0,
     }
    }
   },
   mutations: {
    Mutation123(state, message) {
     var CanbusSignal = &quot;Test123&quot;;
     state.data.test.value = message.topic.CanbusSignal;
    }
   }
  }
  </code></pre>
  <p>This doesn't work ofcourse.
  In the code above, it enters <code>message.topic.CanbusSignal</code> My goal is to enter <code>message.topic.Test123</code>.</p>