2 files changed, 38 insertions, 0 deletions
diff --git a/pkg/u/list.go b/pkg/u/list.go
index cf71909..7271ef3 100644
--- a/pkg/u/list.go
+++ b/pkg/u/list.go
@@ -16,6 +16,14 @@ func FirstOrZero[T any](v []T) T {
 	return v[0]
 }
 
+func Map[T any, V any](ts []T, fun func(T) V) []V {
+	rs := make([]V, len(ts))
+	for i := range ts {
+		rs[i] = fun(ts[i])
+	}
+	return rs
+}
+
 func ChunkBy[T any](items []T, chunkSize int) [][]T {
 	var chunks = make([][]T, 0, (len(items)/chunkSize)+1)
 	for chunkSize < len(items) {
diff --git a/pkg/u/list_test.go b/pkg/u/list_test.go
index 805a209..3a856b9 100644
--- a/pkg/u/list_test.go
+++ b/pkg/u/list_test.go
@@ -3,6 +3,7 @@
 package u
 
 import (
+	"strconv"
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
@@ -129,3 +130,32 @@ func TestFirstOrZero(t *testing.T) {
 		})
 	}
 }
+
+func TestMap(t *testing.T) {
+	testCases := []struct {
+		name string
+		in   []int
+		out  []string
+	}{
+		{
+			name: "empty",
+			in:   []int{},
+			out:  []string{},
+		},
+		{
+			name: "not empty",
+			in:   []int{1, 2, 3},
+			out:  []string{"1", "2", "3"},
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			out := Map(tc.in, func(v int) string { return strconv.Itoa(v) })
+
+			if diff := cmp.Diff(tc.out, out); diff != "" {
+				t.Errorf("Map error:\n%s", diff)
+			}
+		})
+	}
+}