Answer
Singleton: Only one instance allowed.
Factory: Creates objects without exposing creation logic.
Quick Answer
Singleton: only one instance ever created — a shared DB connection, a config object. class Config { static instance; static getInstance() { if (!this.instance) this.instance = new Config(); return this.instance; } }. Factory: creates objects without exposing constructor logic — function createUser(role) returns different user objects based on role. Factory is more flexible; Singleton is for shared global state.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
Want to bookmark, take notes, or join discussions?
Sign in to access all features and personalize your learning experience.
Source: SugharaIQ