Comments (3)
@pedropedruzzi, thanks for this interesting quirk!
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Thanks for adding it! Note: this is not only for arrays. Every generic type in TypeScript is covariant. For example:
interface Reference<T> {
value?: T;
}
function testInterface() {
const circleRef: Reference<Circle> = {};
const shapeRef: Reference<Shape> = circleRef; // ISSUE: should be syntax error: Type 'Reference<Circle>' is not assignable to type 'Reference<Shape>'
const square: Square = { name: 'square of length 10', length: 10 };
const shape: Shape = square;
shapeRef.value = shape; // allowed because shapeRef is a Reference<Shape> in compile time
shapeRef.value = square; // same
const circle: Circle | undefined = circleRef.value; // this is a Square not a Circle!
return circle;
}
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@pedropedruzzi, thanks, it has been updated.
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Related Issues (5)
- "Fixes" HOT 1
- Poor readability on Python example HOT 1
- Maybe require a proper readme.md for every submission HOT 2
- Reduce nesting HOT 2
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