use methods in vue3 composition api code example

Example 1: vue 3 composition api watch

// directly watching a ref

const selected = ref(props.selected)

watch(selected, (selection, prevSelection) => { 
   /* ... */ 
})

Example 2: fetch composition API in Vue3

# http requests using Fetcht api in Vue 3 explained (see videos below) 
https://www.youtube.com/watch?v=-Aoyja_BjZY
https://www.youtube.com/watch?v=LvOYCjpMQ10