LLD - Design — Elevator System
Given an elevator state machine with states: Idle, MovingUp, MovingDown, DoorOpen. If the elevator is Idle and receives a 'GoUp' event, what is the next state?
Given an elevator state machine with states: Idle, MovingUp, MovingDown, DoorOpen. If the elevator is Idle and receives a 'GoUp' event, what is the next state?
medium📝 Analysis Q4 of Q15
Step-by-Step Solution
Solution:
Step 1: Identify current state and event
Current state is Idle; event is 'GoUp'.Step 2: Determine transition based on event
'GoUp' event triggers transition from Idle to MovingUp state.Final Answer:
MovingUp -> Option BQuick Check:
Idle + GoUp = MovingUp [OK]
Quick Trick: GoUp event moves elevator to MovingUp state [OK]
Common Mistakes:
MISTAKES- Choosing DoorOpen instead of MovingUp
- Staying in Idle state incorrectly
- Confusing MovingDown with MovingUp
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