hue hue hue

internal/gentools/maps.go

@@ -0,0 +1,16 @@
+package gentools
+
+func CopyMap[K comparable, V any](m map[K]V) map[K]V {
+	m2 := make(map[K]V, len(m))
+	for k, v := range m {
+		m2[k] = v
+	}
+
+	return m2
+}
+
+func OneItemMap[K comparable, V any](key K, value V) map[K]V {
+	m := make(map[K]V, 1)
+	m[key] = value
+	return m
+}

internal/gentools/ptr.go

@@ -5,6 +5,16 @@ func Ptr[T any](t T) *T {
 }
 
 func ShallowCopy[T any](t *T) *T {
+	if t == nil {
+		return t
+	}
+
 	tCopy := *t
 	return &tCopy
 }
+
+func ShallowCopyTo[T any](dst **T, src *T) {
+	if src != nil {
+		*dst = ShallowCopy(src)
+	}
+}

internal/gentools/slices.go

@@ -22,3 +22,21 @@ Outer:
 		*arr = append(*arr, v)
 	}
 }
+
+func Map[T any, U any](arr []T, cb func(T) U) []U {
+	arr2 := make([]U, len(arr))
+	for i, v := range arr {
+		arr2[i] = cb(v)
+	}
+
+	return arr2
+}
+
+func Flatten[T any](arr [][]T) []T {
+	arr2 := make([]T, 0, 128)
+	for _, sub := range arr {
+		arr2 = sub
+	}
+
+	return arr2
+}