Get by dotted path in JavaScript
JavaScript interview exercise on Objects, difficulty 3 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
Write deepGet(obj, path, fallback) where path is a dotted string like "a.b.c" and may include array indexes like "items[0].name". Return fallback if any step is missing.
Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Progress is saved in your browser, and in your account if you sign in.