Derived State of Blog Example

ex_derived_state_of.kt

@Composable
private fun PostHashtags(
    hashtags: ImmutableList<String>,
    onAddHashTag: (String) -> Unit,
    modifier: Modifier
) {
    var inputHashTag by remember(hashtags) { mutableStateOf("") }

    Column(modifier = modifier) {
        OutlinedTextField(
            value = inputHashTag,
            onValueChange = { inputHashTag = it },
            leadingIcon = { Text(text = "#", fontWeight = FontWeight.Bold) },
            placeholder = { Text(text = "Type a hashtag here") },
            trailingIcon = {
                IconButton(onClick = { onAddHashTag(inputHashTag) }) {
                    Icon(imageVector = Icons.Default.AddCircle, 
                         contentDescription = "Add hashtag")
                }
            },
        )
        ReusableVerticalLazyList(content = hashtags)
    }
}