Consider a system where the state changes based on commands:

medium📝 Analysis Q5 of 15

LLD - Design — Elevator System

Consider a system where the state changes based on commands:
if current_state == moving_up and command == moveDown: current_state = moving_down
What will be the state after starting at moving_up and receiving moveDown command?

Amoving_down

Bmoving_up

Cidle

Derror

Step-by-Step Solution

Solution:

Step 1: Analyze the condition
If current state is moving_up and command is moveDown, state changes to moving_down.
Step 2: Apply given inputs
Starting at moving_up and receiving moveDown triggers the condition, so state becomes moving_down.
Final Answer:
moving_down -> Option A
Quick Check:
Command changes moving_up to moving_down [OK]

Quick Trick: Command moveDown switches moving_up to moving_down [OK]

Common Mistakes:

MISTAKES

Ignoring command effect
Assuming state stays same
Confusing moveDown with stop

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Consider a system where the state changes based on commands:

Step 1: Analyze the condition

Step 2: Apply given inputs

Final Answer:

Quick Check:

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