Add full-file example for JSON parsingHEADv1.0.2main

1 files changed, 38 insertions, 0 deletions

diff --git a/optional/example_json_test.go b/optional/example_json_test.go
new file mode 100644
index 0000000..d4de4a6
--- /dev/null
+++ b/optional/example_json_test.go
@@ -0,0 +1,38 @@
+package optional_test
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+
+	"xengineering.eu/optional-go/optional"
+)
+
+type Message struct {
+	Present optional.Optional[string]
+	Null    optional.Optional[bool]
+	Missing optional.Optional[int]
+}
+
+func Example_json() {
+	text := `{
+		"present": "value",
+		"null": null
+	}`
+
+	var msg Message
+
+	err := json.Unmarshal([]byte(text), &msg)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Printf(
+		"%t %t %t",
+		msg.Present.Exists,
+		msg.Null.Exists,
+		msg.Missing.Exists,
+	)
+
+	// Output: true false false
+}