juniorScala
What is immutability in Scala?
Updated May 24, 2026
Short answer
Immutability means data cannot be changed after creation.
Deep explanation
It improves thread safety and predictability in functional programming.
Real-world example
Used in distributed systems like Spark.
Common mistakes
- Confusing immutability with absence of updates.
Follow-up questions
- Why is immutability important?
- Are Scala collections immutable?