title: vuetify: calculate grid width by passed props
body: <p>I want to make a menu component that builds same-sized buttons based on the amount of menuItems passed in as props.</p>
  
  <p>similar to
  <a href="https://stackoverflow.com/a/47215040/6066886">https://stackoverflow.com/a/47215040/6066886</a>
  i want to give the v-flex a conditional attribute. (xs6 for two items, xs4 for three and so on)</p>
  
  <p>(something like <code>&lt;v-flex v-for="item in menuItems" xs[12 / menuItems.length]&gt;</code>)</p>
  
  <p>in the linked question, the idea is to pass "xs10" or not, based on a condition.</p>
  
  <p>i want to calculate WHICH of those will be added to my v-flex, but i have no idea how that would be done.. as i can't v-bind anything... can anyone help me?</p>