midScala
What is higher-order function in Scala?
Updated May 24, 2026
Short answer
A function that takes or returns another function.
Deep explanation
They enable functional programming patterns like composition, currying, and abstraction over behavior.
Real-world example
Used in Spark transformations like map and filter.
Common mistakes
- Passing side-effecting functions unintentionally.
Follow-up questions
- What is function composition?
- Are lambdas higher-order functions?