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Add method to get key for a given value #27

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Add method to get key for a given value #27

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9 changes: 9 additions & 0 deletions orderedmap.go
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Original file line number Diff line number Diff line change
Expand Up @@ -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 {
Expand Down
17 changes: 17 additions & 0 deletions orderedmap_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -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",
Expand Down Expand Up @@ -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{
Expand Down Expand Up @@ -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) {
Expand Down