[Solved] You are designing a state machine for an elevator with states idle,... Which design choice best ensures scalability and clear control flow when adding more states like door open or maintenance? | LLD

LLD - Design — Elevator System

You are designing a state machine for an elevator with states idle, moving up, and moving down. Which design choice best ensures scalability and clear control flow when adding more states like door open or maintenance?

AHardcode state changes inside each function without a state map

BUse a centralized state manager with explicit allowed transitions and event handlers

CUse global variables and if-else checks scattered across code

DIgnore state management and rely on random delays

Step-by-Step Solution

Solution:

Step 1: Consider scalability and clarity
A centralized state manager clearly defines states and allowed transitions, making it easier to add new states and maintain control flow.
Step 2: Evaluate other options
Using global variables or hardcoding state changes leads to messy, error-prone code. Ignoring state management causes unpredictable behavior.
Final Answer:
Use a centralized state manager with explicit allowed transitions and event handlers -> Option B
Quick Check:
Centralized state management = scalable and clear [OK]

Quick Trick: Centralize state logic for easier scaling and maintenance [OK]

Common Mistakes:

MISTAKES

Scattering state logic causing bugs
Hardcoding states making changes hard
Ignoring state management leads to chaos

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Which design choice best ensures scalability and clear control flow when adding more states like door open or maintenance?

Step 1: Consider scalability and clarity

Step 2: Evaluate other options

Final Answer:

Quick Check:

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