Answers for "how to use v-if in vue"

vue v-if

<div v-if="Math.random() > 0.5">
  Now you see me
</div>
<div v-else>
  Now you don't
</div>

vue v-if compare string

<span v-for="role in user.roles">
    <span v-if="role.name == 'Admin'">Yes</span>
    <span v-else>-</span>
</span>

vue if

<h1 v-if="variable">Vue is awesome!</h1>