Add IsStr check function

string.go

@@ -138,6 +138,15 @@ func TryToString(v any) (string, error) {
 	return TryStr(v)
 }
 
+// IsStr returns true if value is string
+func IsStr(v any) bool {
+	if v == nil {
+		return false
+	}
+	_, ok := v.(string)
+	return ok
+}
+
 // IsStrContainsOf returns true if input string contains only chars from subset
 func IsStrContainsOf(s, subset string) bool {
 	if len(s) == 0 {

string_test.go

@@ -43,6 +43,25 @@ func TestToString(t *testing.T) {
 	}
 }
 
+func TestIsStr(t *testing.T) {
+	tests := []struct {
+		value  any
+		target bool
+	}{
+		{value: 1, target: false},
+		{value: nil, target: false},
+		{value: int8(1), target: false},
+		{value: int16(1), target: false},
+		{value: []byte("notstr"), target: false},
+		{value: []int8{1, 2, 3, 4, 5}, target: false},
+		{value: []any{'1', '2', '3'}, target: false},
+		{value: "str", target: true},
+	}
+	for _, test := range tests {
+		assert.Equal(t, IsStr(test.value), test.target)
+	}
+}
+
 func BenchmarkToStringByReflect(b *testing.B) {
 	b.ReportAllocs()
 	b.RunParallel(func(pb *testing.PB) {