A custom pipe in Angular
Angular interview exercise on Pipes & directives, 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 TruncatePipe (name "truncate"): transform(text, max = 20, suffix = "…") returns the text unchanged when it fits in max characters, otherwise the first max characters followed by the suffix. PreviewComponent shows `body` truncated to 12 characters in <p class="preview">.
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.