Check value in array exists Flutter dart

Question

I am trying to check condition

if (value in List) {   exist } else {    not exist } 

but nothing to help anyone having an idea then please share.

My List = _quantityController[]; 

itemId is integer

i want to check my item id exists in my list array or not...Thanks!

Answer 1

list.contains(x); 

Contains method

Answer 2

Above are the correct answers to the current question. But if someone like me is here to check value inside List of Class object then here is the answer.

class DownloadedFile {  String Url;  String location; } 

List of DownloadedFile

List<DownloadedFile> listOfDownloadedFile = List(); listOfDownloadedFile.add(...); 

Now check if a specific value is inside this list

var contain = listOfDownloadedFile.where((element) => element.Url == "your URL link"); if (contain.isEmpty)    //value not exists else   //value exists 

There maybe better way/approach. If someone know, then let me know. :)