obitools4/autodoc/docmd/pkg/obiutils/set_test.md

obiutils Package: Set Implementation in Go

The obiutils package provides a generic, type-safe set data structure for Go (v1.18+), along with comprehensive unit tests.

Core Features

• Generic Set Type: Implemented as Set[T], using a map for O(1) membership checks.
• Constructors:
  • MakeSet[T](...T) returns a new set populated with given elements.
  • NewSet[T]() allocates an empty pointer to a set; useful for dynamic initialization.
• Methods:
  • Add(...T) inserts one or more elements (idempotent).
  • Contains(T) bool checks membership.
  • Members() []T returns a sorted slice of elements (deterministic iteration).
  • String() string provides human-readable representation ([a b c] format).
• Set Operations:
  • Union(other Set[T]) Set[T]: returns a new set with elements in either operand.
  • Intersection(other Set[T]) Set[T]: returns a new set with elements common to both.

Test Coverage

Unit tests validate:

• Set creation (empty, single/multiple values).
• Element addition and membership.
• String formatting for various sizes.
• Correctness of union/intersection across edge cases (empty sets, disjoint/common elements).

All tests use reflect.DeepEqual for precise structural comparison and sort outputs where order is non-deterministic.

Design Notes

• Immutable operations: methods return new sets rather than mutating in-place.
• No duplicate support (standard set semantics).
• Efficient storage via Go maps; no external dependencies.

Note

: This is a minimal, idiomatic set implementation—ideal for utility or testing contexts.