Generics in Go

From the Go cheat sheet · Generics · verified Jul 2026

Generics

Generic functions and types with type parameters

// Generic function
func Map[T any, U any](s []T, f func(T) U) []U {
    result := make([]U, len(s))
    for i, v := range s {
        result[i] = f(v)
    }
    return result
}

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

🎯 Available since Go 1.18 — use any for unconstrained types

💡 ~ means underlying type (e.g., ~int matches type MyInt int)

📌 comparable constraint allows == and != operations

⚡ Type inference often lets you omit type arguments at call site

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