vuejs_course/2021-07-30_composition-01-starting-setup/src/components/UserData.vue

<template>
  <h2>{{ userName }}</h2>
  <h3>{{ age }}</h3>
</template>

<script>
import { computed, inject } from 'vue';
export default {
  props: ['firstName', 'lastName'],
  setup(props) {
    const userName = computed(function() {
      return props.firstName + ' ' + props.lastName;
    });

    const age = inject('user-age');

    return {
      userName,
      age
    };
  }
};
</script>

<style></style>