born

.gitignore

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+.idea

go.mod

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+module github.com/pmorelli92/maybe
+
+go 1.16

int.go

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+package maybe
+
+import "encoding/json"
+
+type Int struct {
+	Value    int
+	HasValue bool
+}
+
+func (ms *Int) UnmarshalJSON(data []byte) error {
+	var s *int
+	if err := json.Unmarshal(data, &s); err != nil {
+		return err
+	}
+
+	if s != nil {
+		*ms = Int{
+			Value:    *s,
+			HasValue: true,
+		}
+	}
+
+	return nil
+}
+
+func (ms Int) MarshalJSON() ([]byte, error) {
+	var s *int
+
+	if ms.HasValue {
+		s = &ms.Value
+	}
+
+	return json.Marshal(s)
+}

string.go

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+package maybe
+
+import "encoding/json"
+
+type String struct {
+	Value    string
+	HasValue bool
+}
+
+func (ms *String) UnmarshalJSON(data []byte) error {
+	var s *string
+	if err := json.Unmarshal(data, &s); err != nil {
+		return err
+	}
+
+	if s != nil {
+		*ms = String{
+			Value:    *s,
+			HasValue: true,
+		}
+	}
+
+	return nil
+}
+
+func (ms String) MarshalJSON() ([]byte, error) {
+	var s *string
+
+	if ms.HasValue {
+		s = &ms.Value
+	}
+
+	return json.Marshal(s)
+}