I have a vue playground.

The container component needs to be able to control the display status of an unknown number of children in the default slot.

I assume the child components will need to hold a property or have some way of identifying themselves to their container.

How can the container change the display property of one of the components in the default slot?

App.vue

<script setup>
import Container from './Container.vue'
import ChildA from './ChildA.vue'
import ChildB from './ChildB.vue'
</script>

<template>
    <Container>
        <ChildA />
        <ChildB />
    </Container>
</template>

Container.vue

<script setup>
import { useSlots, useAttrs, onMounted} from 'vue'

const slots = useSlots()

function logSlots(where) {
  console.log( `${where} slots`, slots )
  const children = slots.default()
  console.log( `${where} slots children`, children.length, children )
}

logSlots("setup")

function changeDisplay(whichChild, show) {
  console.log( "change display", whichChild, show)
  // how can I know I am accessing child a?
  // what goes here?
}

onMounted( () => {
  logSlots("onMounted")
})
</script>

<template>
  <button @click="logSlots('button')">log slots</button>
  <button @click="changeDisplay('child a', false)">Hide Child A</button>
  <button @click="changeDisplay('child a', true)">Show Child A</button>

  <slot />
</template>

ChildA.vue

<script setup>
</script>

<template>
  <div>
    ChildA
  </div>
</template>

ChildB.vue

<script setup>
</script>

<template>
  <div>
    ChildB
  </div>
</template>