From 664542c32438498e71455761c242d3df991e88f7 Mon Sep 17 00:00:00 2001
From: Beorn Facchini <beornf@gmail.com>
Date: Fri, 8 Oct 2021 00:50:25 +1100
Subject: [PATCH] Add method to get key for a given value

---
 orderedmap.go      |  9 +++++++++
 orderedmap_test.go | 17 +++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/orderedmap.go b/orderedmap.go
index 2341f91..ac56dd7 100644
--- a/orderedmap.go
+++ b/orderedmap.go
@@ -51,6 +51,15 @@ func (o *OrderedMap) Get(key string) (interface{}, bool) {
 	return val, exists
 }
 
+func (o *OrderedMap) GetKey(value interface{}) (string, bool) {
+	for _, key := range o.keys {
+		if o.values[key] == value {
+			return key, true
+		}
+	}
+	return "", false
+}
+
 func (o *OrderedMap) Set(key string, value interface{}) {
 	_, exists := o.values[key]
 	if !exists {
diff --git a/orderedmap_test.go b/orderedmap_test.go
index dfc50f1..188dc8f 100644
--- a/orderedmap_test.go
+++ b/orderedmap_test.go
@@ -16,12 +16,20 @@ func TestOrderedMap(t *testing.T) {
 	if v.(int) != 3 {
 		t.Error("Set number")
 	}
+	k, _ := o.GetKey(3)
+	if k != "number" {
+		t.Error("Get number key")
+	}
 	// string
 	o.Set("string", "x")
 	v, _ = o.Get("string")
 	if v.(string) != "x" {
 		t.Error("Set string")
 	}
+	k, _ = o.GetKey("x")
+	if k != "string" {
+		t.Error("Get string key")
+	}
 	// string slice
 	o.Set("strings", []string{
 		"t",
@@ -52,6 +60,10 @@ func TestOrderedMap(t *testing.T) {
 	if v.(int) != 4 {
 		t.Error("Override existing key")
 	}
+	k, _ = o.GetKey(4)
+	if k != "number" {
+		t.Error("Get number key")
+	}
 	// Keys method
 	keys := o.Keys()
 	expectedKeys := []string{
@@ -80,6 +92,11 @@ func TestOrderedMap(t *testing.T) {
 	if ok {
 		t.Error("Delete did not remove 'strings' key")
 	}
+	o.Delete("number")
+	_, ok = o.GetKey(4)
+	if ok {
+		t.Error("Delete did not remove 'number' key")
+	}
 }
 
 func TestBlankMarshalJSON(t *testing.T) {