Generics (Type Parameters)

Writing reusable, type-safe data structures and algorithms without `any` casting.

Real-World Analogy (Mental Model)

“A universal blender container that can blend apples, oranges, or protein powder with 100% type safety without needing 3 separate blenders.”

Key Concepts & Rules To Remember

Syntax: `func Map[T any, R any](s []T, f func(T) R) []R`.
`comparable` constraint allows using `==` and `!=`.
Tilde operator `~int` matches custom types whose underlying type is `int`.

Step-by-Step Code

1. Understanding Generics (Type Parameters)

Writing reusable, type-safe data structures and algorithms without `any` casting. In Go, generics (type parameters) is designed around clarity and high runtime efficiency.

example.goGo 1.24+

func Min[T int | float64](a, b T) T {
    if a < b { return a }
    return b
}

Common Beginner Pitfalls & Mistakes

Mistake: Misusing generics (type parameters) 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 Generics (Type Parameters)?

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