vidhill · February 3, 2022 14:46 · Feb 3, 2022 · Feb 3, 2022 · Feb 3, 2022
diff --git a/main.go b/main.go
@@ -5,7 +5,6 @@ import (
 )
 
 func main() {
-
 	doggo := Dog{
 		Name: "Fluffy",
 	}
@@ -18,5 +17,4 @@ func main() {
 	}
 
 	fmt.Println(fieldName)
-
 }
diff --git a/util.go b/util.go
@@ -1,3 +1,4 @@
+// main logic sourced from https://stackoverflow.com/a/69061124
 package main
 
 import (
@@ -14,6 +15,8 @@ func getStructTag(f reflect.StructField, tagName string) string {
 	return string(f.Tag.Get(tagName))
 }
 
+// based on the function used in the go standard library "encoding/json" source
+// https://cs.opensource.google/go/go/+/refs/tags/go1.17.6:src/encoding/json/tags.go;l=17
 func extractFieldName(tag string) string {
 	if idx := strings.Index(tag, ","); idx != -1 {
 		return tag[:idx]

diff --git a/go.mod b/go.mod
@@ -0,0 +1,6 @@
+module dummy/foo
+
+go 1.14
+
+require (
+)
diff --git a/main.go b/main.go
@@ -0,0 +1,22 @@
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+
+	doggo := Dog{
+		Name: "Fluffy",
+	}
+
+	fieldName, e := getJsonTagValue(doggo, "Name")
+
+	if e != nil {
+		fmt.Println(e.Error())
+		return
+	}
+
+	fmt.Println(fieldName)
+
+}
diff --git a/util.go b/util.go
@@ -0,0 +1,39 @@
+package main
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+)
+
+type Dog struct {
+	Name string `json:"bar,omitempty"`
+}
+
+func getStructTag(f reflect.StructField, tagName string) string {
+	return string(f.Tag.Get(tagName))
+}
+
+func extractFieldName(tag string) string {
+	if idx := strings.Index(tag, ","); idx != -1 {
+		return tag[:idx]
+	}
+	return tag
+}
+
+func GetStructField(f Dog, fieldName string) (reflect.StructField, error) {
+	field, ok := reflect.TypeOf(&f).Elem().FieldByName(fieldName)
+	if !ok {
+		emptyValue := reflect.StructField{}
+		return emptyValue, fmt.Errorf(`the field with the name "%s" was not found`, fieldName)
+	}
+	return field, nil
+}
+
+// Returns the json tag for a given struct field
+func getJsonTagValue(f Dog, fieldName string) (string, error) {
+	field, err := GetStructField(f, fieldName)
+
+	tag := getStructTag(field, "json")
+	return extractFieldName(tag), err
+}
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