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🟣 Level 4 — Composite Data
Memory & Types
Arrays (Fixed Size)
Fixed-length sequential blocks of memory with value-copy semantics.
Real-World Analogy (Mental Model)
“A 12-slot egg carton: the size is fixed at manufacture. You cannot fit 13 eggs in a 12-egg carton, and passing the carton to a friend copies all 12 eggs.”
Key Concepts & Rules To Remember
- Fixed length is part of the type signature: `[5]int` is distinct from `[10]int`.
- Value semantics: assigning copies the entire memory block.
- Serves as the underlying backing storage for dynamic slices.
Step-by-Step Code
1. Understanding Arrays (Fixed Size)
Fixed-length sequential blocks of memory with value-copy semantics. In Go, arrays (fixed size) is designed around clarity and high runtime efficiency.
example.goGo 1.24+
var scores [3]int = [3]int{90, 85, 95}
b := scores // Copies all 3 integers!Common Beginner Pitfalls & Mistakes
Mistake: Misusing arrays (fixed size) without understanding its memory or concurrency semantics.
✅ Correct Way: Always follow standard Go idioms and verify with tests.
Self Assessment
Knowledge Check
Verify your understanding with these interactive practice questions.
Quizzes
Quick checks for understanding
Multiple-choice with inline explanations—expand to see why.
What is the primary concept behind Arrays (Fixed Size)?
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