The argument type 'String"?"' can't be assigned to the parameter type 'String'

Question

The argument type 'String?' can't be assigned to the parameter type 'String'

how can pass the parameter ?

https://dart.dev/null-safety/understanding-null-safety#non-nullable-and-nullable-types — Dinesh Nagarajan, Aug 09 '21 at 18:31
your question has already been answered [here](https://stackoverflow.com/questions/66798782/error-the-argument-type-string-cant-be-assigned-to-the-parameter-type-stri) — Benyamin, Aug 09 '21 at 18:31

score 6 · Answer 1 · answered Aug 29 '21 at 03:48

6

You can try this

child: TipsCard(
//
image:tipsPages[i]["image"] as String,//
)

answered Aug 29 '21 at 03:48

Rasathurai Karan

score 2 · Accepted Answer · answered Aug 09 '21 at 18:31

2

You can do this:

//...

child: TipsCard(
//...
image: tipsPages[i]["image"] ?? "", // Replace this blank "" with a default image url of your choice
),

answered Aug 09 '21 at 18:31

Bach

it's work thank you but I want to ask you why it's want after initialize char "?" like (String?) and how can remove this feature ? @Bach – MSameer Aug 09 '21 at 18:40
@MSameer This is a feature introduce with Dart 2.0, kind of like a revolution change that make Dart a null-safe language, so the only way to not using it is to convert Dart back to 1.0. The `?` is to indicate that the variable can be null. My recommendation is to learn using this feature instead of turning it off, since it'll help us a lot in avoiding potential bugs with null values. There's a quite nice video here from Flutter team: https://www.youtube.com/watch?v=iYhOU9AuaFs – Bach Aug 10 '21 at 09:11

2 Answers2