Truncate with an ellipsis in JavaScript
JavaScript interview exercise on Strings, difficulty 1 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
Write truncate(str, max) that returns str unchanged if its length is ≤ max, otherwise the first max characters followed by "…" (a single character).
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.