Let's make new Feature ?== or ??=

[Hellomik2002]

a == null ? null : something(a)

let's change to

a ?== something(a)

it is a little fun feature like this

a ?? false

[znjameswu]

FYI, ??= is an existing operator for nullable assignment.

[mit-mit]

Yes, I think you are describing the current null-aware assignment operator:
https://dart.dev/guides/language/language-tour#assignment-operators

// Assign value to a
a = value;
// Assign value to b if b is null; otherwise, b stays the same
b ??= value;

[Hellomik2002]

final a = null or 'some string'
I don't want to assign value to a,
I mean
final c = a == null ? null : something(a)
use like
final c = a ?== something(a)
??= can not change value of final variable

[mit-mit]

Sorry, I don't understand. Can you specify in a bit more detail what the semantics of this proposed construct are?

[eernstg]

I think the proposal is to have syntax for evaluating something(a) if a is non-null, like

((v) => v != null ? something(v) : null)(a)

and, in general, to enable "subexpression null shorting" in the sense that an expression is evaluated only if certain subexpressions are non-null.

We have had some discussions about this before (but there doesn't seem to be an issue specifically on that, so it must have been individual comments in other discussions, e.g., this one).