Free coding interview video lessons
Follow a worked explanation, jump to a chapter, and compare the recording with the current lesson code. All four videos are public and can be watched without a course account.
Walk a Matrix | Coding Interview Question
Watch a clockwise spiral traversal, trace shrinking boundaries, and review the corrected final-edge behavior in the current lesson.
17 min · Chapter links and lesson notesBuild a JavaScript Promise
Watch a teaching implementation of a JavaScript promise, then compare settlement and callback scheduling with the current lesson.
25 min · Chapter links and lesson notesDebounce | JavaScript Interview Question
Watch how a trailing debounce resets its timer, retains the latest call, and waits until an event burst stops.
14 min · Chapter links and lesson notesImplement Throttle | Coding Interview Question
Watch leading and trailing throttle behavior, track pending calls, and review the fix for absent or falsy arguments.
13 min · Chapter links and lesson notes