added xslices.Map

Author: asmyasnikov

internal/xslices/map.go

@@ -0,0 +1,11 @@
+package xslices
+
+func Map[Key comparable, T any](x []T, key func(t T) Key) map[Key]T {
+	m := make(map[Key]T, len(x))
+
+	for i := range x {
+		m[key(x[i])] = x[i]
+	}
+
+	return m
+}

internal/xslices/map_test.go

@@ -0,0 +1,18 @@
+package xslices
+
+import (
+	"github.com/stretchr/testify/require"
+	"strconv"
+	"testing"
+)
+
+func TestMap(t *testing.T) {
+	require.Equal(t,
+		map[string]int{
+			"1": 1,
+			"2": 2,
+			"3": 3,
+		},
+		Map([]int{1, 2, 3}, strconv.Itoa),
+	)
+}