Design a Text Editor with Undo and Redo
Medium · Low-Level Design · about 45 minutes
Asked at Microsoft, Google, Adobe, Figma, Canva, Autodesk.
Design the document model of a text editor. Support inserting text at the cursor, deleting a selection, moving the cursor, and undo and redo of every edit, with a configurable limit on how many steps are kept. Typing a word should undo as one step, not one step per character.