init

util/map.go

@@ -0,0 +1,11 @@
+package util
+
+func Map[In, Out any](inSlice []In, predicate func(In) Out) []Out {
+	outSlice := make([]Out, len(inSlice))
+
+	for i := range inSlice {
+		outSlice[i] = predicate(inSlice[i])
+	}
+
+	return outSlice
+}

util/map_test.go

@@ -0,0 +1,20 @@
+package util_test
+
+import (
+	"strconv"
+	"testing"
+
+	"github.com/genudine/saerro-go/util"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMap(t *testing.T) {
+	dolls := []int64{44203, 41666, 79579, 63741, 57213}
+
+	result := util.Map(dolls, func(doll int64) string {
+		return strconv.FormatInt(doll, 16)
+	})
+
+	assert.Contains(t, result, "acab")
+	assert.Len(t, result, len(dolls))
+}