merge

func ByKey ¶

func ByKey[T any](base, custom []T, keyFn func(T) string, onCollide func(base, custom T) T) []T

ByKey merges two slices by identity key. For entries with a non-empty key (returned by keyFn), a custom entry that shares a key with a base entry triggers onCollide(base, custom); the return value replaces the base entry. Custom entries with no matching base key are appended. Non-keyed entries (empty key) are always appended. Duplicate keys within custom are collapsed; the first occurrence takes effect.