content()

content

@Composable
fun MyCustomContainer(header: String = "", content: @Composable () -> Unit) {
    Column() {
        if (header.isNotBlank()) {
            Text(text = header)
        }
        content()
    }
}

modifier

Modifier

Column

ColumnScope

content

consider propagating the 

ColumnScope

 receiver to 

content

@Composable fun MyCustomContainer(
  modifier: Modifier = Modifier,
  header: String = "",
  content: @Composable ColumnScope.() -> Unit
) = Column(modifier) {
  if (header.isNotBlank()) {
    Text(header)
  }
  content()
}

content: @Composable ColumnScope.() -> Unit

//Key points
//1. Modifier goes first as per convention and we pass it down to internal column so those modifiers are propagated to that layout
//2. This uses a "slot api" in order to pass in content for the container
//3. Marking "content" as a Type of ColumnScope allows us to any ColumnScope child modifiers (not sure what this means yet)
@Composable
fun Container(modifier: Modifier = Modifier, header: String = "", content: @Composable ColumnScope.() -> Unit) {
    Column(modifier) {
        if (header.isNotBlank()) {
            Text(text = header)
        }
        content()
    }
}

Modifier.weight