Darts: Converting Fat Arrow Syntax into elaborate syntax

The fat arrow is a short hand for creating a new symbol.

Many articles talks about how to convert declaration of function into fat arrows.  But not vice-versa.

Lets talk about an example in Google Codelabs and show the 2 simple steps to do so.

Original Code

Navigator.push(context, MaterialPageRoute(builder: (context) => DetailScreen(dtodo: todos[index]),),);

1a. Replace fat arrow by {

Navigator.push(context, MaterialPageRoute(builder: (context) =>  { DetailScreen(dtodo: todos[index]),),);

1b. Isolate the another end of the function and close it with }

Navigator.push(context, MaterialPageRoute(builder: (context) =>  { DetailScreen(dtodo: todos[index]),}
),
);

2.Add Return and replace the , by ;

Navigator.push(context, MaterialPageRoute(builder: (context) =>  { 


 return DetailScreen(dtodo: todos[index]),;}
),
);

Navigator.push(context, MaterialPageRoute(builder: (context)
    {
    return DetailScreen(dtodo: todos[index]);}//DetailScreen
),//MaterialPageRoute);//Navigator 

For more on how to use Fat Arrow see video