Can you explain the contrast between the following:
interface MyType {
f<T>(other: T): this & T;
}
versus
interface MyType {
f<T>(other: T): MyType & T;
}
? Your insights would be highly appreciated!
Can you explain the contrast between the following:
interface MyType {
f<T>(other: T): this & T;
}
versus
interface MyType {
f<T>(other: T): MyType & T;
}
? Your insights would be highly appreciated!
The this type varies depending on the implementing class, so with the initial definition, the code below will pass the type check:
class Foo implements MyType {
f<T>(other: T): T & this { ... }
g(): string { return "only in foo"; }
}
var foo: Foo
var ff = foo.f("dsklf");
var s: string = ff.g();
Because ff is of type Foo & string, making it a subtype of Foo.
However, with the alternative definition of MyType, calling ff.g() will fail the type check as g is not defined on MyType & string.
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