Learn APL with Real Code Examples
Updated Nov 20, 2025
Learning Path
Learn core symbols and monadic/dyadic functions
Practice vector/matrix operations
Study reduce, scan, and each
Build functions and tacit expressions
Explore real-world modeling projects
Skill Improvement Plan
Week 1: Symbols and basic arrays
Week 2: Matrix operations and operators
Week 3: Functions and tacit style
Week 4: Applied numeric problems
Week 5: Integrations and performance tuning
Interview Questions
What makes APL unique?
Explain monadic vs dyadic functions.
What is an operator in APL?
How does APL handle arrays of any rank?
Where is APL used in industry?
Cheat Sheet
+/⍳10 - sum of first 10 integers
⍴ - reshape
∘.× - outer product
⌈/ - maximum reduction
⊢,⊣ - identity and left/right arguments
Books
A Programming Language (Kenneth Iverson)
Mastering Dyalog APL
APL Applied to Finance
Mathematical Programming with APL
APL Annotated Reference Manual
Tutorials
Introduction to APL
Array Operations and Functions
Operators: Reduce, Scan, Each
Tacit Programming in APL
Building Analytical Models
Official Docs
Dyalog APL Documentation
APL Wiki
GNU APL Manual
Community Links
APL Orchard Matrix Chat
Dyalog Forums
GitHub APL Projects
APL Wiki community
APL conference videos
Community Support
Dyalog community forums
APL Orchard chat
GitHub APL repos
APL Wiki
Conference videos (Dyalog user meetings)