Pattern destructuring could enable calling FunctionTypes #4234
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Description
Today we have patterns that allow us to deconstruct a variable:
class Class {
int myField = 0;
}
void foo() {
var instance = Class();
if (instance case Class(myField: var myFieldValue)) {}
}I think of this structure like:
// getter assigns to variable
Class(myField: var myFieldValue)Basically the = operator but swapped:
var myFieldValue = instance.myField;We also can get a method as a FunctionType:
class Class {
int foo() => 0;
}
void foo() {
var instance = Class();
if (instance case Class(foo: var fooFn)) {
fooFn(3);
}
}I'd like to request a change in that we could:
if (instance case Class(foo(3): var fooValue)) {And for Future we could add await before var like:
class Class {
Future<int> foo() async => 0;
}
void foo() async {
var instance = Class();
if (instance case Class(foo(3): await var fooValue)) {
print(fooValue);
}
}