feat(Go-Tool)：

2020/12/16: 添加YAML和结构体转换工具

vendor/github.com/ahmetb/go-linq/groupby.go

@@ -6,14 +6,11 @@ type Group struct {
 	Group []interface{}
 }
 
-// GroupBy method groups the elements of a collection according
-// to a specified key selector function and projects the elements for each group
-// by using a specified function.
-func (q Query) GroupBy(
-	keySelector func(interface{}) interface{},
-	elementSelector func(interface{}) interface{},
-) Query {
-
+// GroupBy method groups the elements of a collection according to a specified
+// key selector function and projects the elements for each group by using a
+// specified function.
+func (q Query) GroupBy(keySelector func(interface{}) interface{},
+	elementSelector func(interface{}) interface{}) Query {
 	return Query{
 		func() Iterator {
 			next := q.Iterate()
@@ -46,3 +43,39 @@ func (q Query) GroupBy(
 		},
 	}
 }
+
+// GroupByT is the typed version of GroupBy.
+//
+//   - keySelectorFn is of type "func(TSource) TKey"
+//   - elementSelectorFn is of type "func(TSource) TElement"
+//
+// NOTE: GroupBy has better performance than GroupByT.
+func (q Query) GroupByT(keySelectorFn interface{},
+	elementSelectorFn interface{}) Query {
+	keySelectorGenericFunc, err := newGenericFunc(
+		"GroupByT", "keySelectorFn", keySelectorFn,
+		simpleParamValidator(newElemTypeSlice(new(genericType)), newElemTypeSlice(new(genericType))),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	keySelectorFunc := func(item interface{}) interface{} {
+		return keySelectorGenericFunc.Call(item)
+	}
+
+	elementSelectorGenericFunc, err := newGenericFunc(
+		"GroupByT", "elementSelectorFn", elementSelectorFn,
+		simpleParamValidator(newElemTypeSlice(new(genericType)), newElemTypeSlice(new(genericType))),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	elementSelectorFunc := func(item interface{}) interface{} {
+		return elementSelectorGenericFunc.Call(item)
+
+	}
+
+	return q.GroupBy(keySelectorFunc, elementSelectorFunc)
+}