Typed props with defaults in Vue
Vue interview exercise on Props & events, difficulty 1 of 3. Solve it in the editor beside a worked example, or cold in Interview mode with the example hidden; the tests run the moment you do.
Write Avatar with props `name` (string, required) and `size` (number, default 40, valid only when 24, 40 or 64: use a validator): a <span class="avatar size-<size>"> whose title is the name and whose text is the initials (the first letter of the first two words, upper-cased).
Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Interview mode hides the example: solve it from memory, without the hint or the solution, and it counts as solved cold. Progress is saved in your browser, and in your account if you sign in.