v-form validation vuetify code example

Example: form vuetify

<v-form>
    <v-text-field
      v-model="firstname"
      label="First name"
    ></v-text-field>
    <v-text-field
      v-model="lastname"
      label="Last name"
    ></v-text-field>
    <v-text-field
      v-model="email"
      label="E-mail"
    ></v-text-field>
  </v-form>