Feature: firstOrElse variant in List

[Antoniossss]

It would be convinient to have variation of first property as method that would allow something to get first element, or produce default value insteaf of throwing wrong state exception..

Right now I am doing something like this (to avoid extra var)

var val=myList.where((i)=>i.x>5).map((i)=>i.y).firstWhere((v)=>true), orElse:()=>someDefaultValue

while I would like to terminate like this:
var val=myList.where((i)=>i.x>5).map((i)=>i.y).firstOrElse(()=>defaultValue);

[lrhn]

It is unlikely that we'll change the List or Iterable APIs at the current time, there are far too many implementations that would then be broken.
This functionality seems like something that can easily be implemented using extension methods, though, and anyone can add that extension.

For now, you can do:

bool kTrue(_) => true;
var val = myList.where((i) =>i.x > 5).map((i) => i.y).firstWhere(kTrue, orElse: () => defaultValue) ;

[Antoniossss]

I have no problem in extending API by myown for own purpose. Actually that is more than fine for me. Can you double check your link for extension methods? It seems to be dead .

[lrhn]

Link fixed.