Hi, based on codelabe on Modifiers :arrow_down: > Note : By convention, the modifier is specified...

# compose

[casablancais]

Hi, based on codelabe on Modifiers ⬇️

Note : By convention, the modifier is specified as the first optional parameter of a function. This enables you to specify a modifier on a composable without having to name all parameters.

Is there a reason why the AppTopBar Modifier was not put as the first parameter in the compose material TopAppBar implementation ?

@Composable
fun TopAppBar(
    title: @Composable () -> Unit,
    modifier: Modifier = Modifier,
    navigationIcon: @Composable (() -> Unit)? = null,
    actions: @Composable RowScope.() -> Unit = {},
    backgroundColor: Color = MaterialTheme.colors.primarySurface,
    contentColor: Color = contentColorFor(backgroundColor),
    elevation: Dp = TopAppBarElevation
) {...}

[Mark Murphy]

I believe that the convention is that modifier is the first parameter in the parameter list with a default value. That fits with the TopAppBar() code that you pasted in, as title does not offer a default value.

[casablancais]

I now understand better, thank you.