DeepFrontend
Learning Paths
Practice
System Design & DS
Design Studio
Data Structures Curriculum
Real-World Case Studies
Careers
Job Board
Resume Builder
Blog
Sign in
Search
⌘K
Go Pro
Loading compiler resources...
TypeScript Quiz Practice
Active Recall Drill Session
← Exit Session
Question 1 of 1
easy
TypeScript
What does marking an interface property with `?` (like `email?: string`) mean?
A
The property must always be null
B
The property is optional — it may be omitted entirely from an object satisfying the interface
C
The property is read-only
D
The property must be a string or undefined, but MUST be explicitly present
Check Answer