init repo

pkg/utils/arr.go

@@ -0,0 +1,21 @@
+package utils
+
+import "math/rand"
+
+func InArray[T comparable](needle T, haystack []T) bool {
+	for _, item := range haystack {
+		if item == needle {
+			return true
+		}
+	}
+	return false
+}
+
+func NewRandNumber(length int) (string, error) {
+	letters := []byte{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'}
+	b := make([]byte, length)
+	for i := range b {
+		b[i] = letters[rand.Intn(len(letters))]
+	}
+	return string(b), nil
+}