feat(Go-Tool)：2020/11/23：修改项目案例(按照一定规则对一组数据进行排序分组)

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

@@ -0,0 +1,79 @@
+package linq
+
+// Except produces the set difference of two sequences. The set difference is
+// the members of the first sequence that don't appear in the second sequence.
+func (q Query) Except(q2 Query) Query {
+	return Query{
+		Iterate: func() Iterator {
+			next := q.Iterate()
+
+			next2 := q2.Iterate()
+			set := make(map[interface{}]bool)
+			for i, ok := next2(); ok; i, ok = next2() {
+				set[i] = true
+			}
+
+			return func() (item interface{}, ok bool) {
+				for item, ok = next(); ok; item, ok = next() {
+					if _, has := set[item]; !has {
+						return
+					}
+				}
+
+				return
+			}
+		},
+	}
+}
+
+// ExceptBy invokes a transform function on each element of a collection and
+// produces the set difference of two sequences. The set difference is the
+// members of the first sequence that don't appear in the second sequence.
+func (q Query) ExceptBy(q2 Query,
+	selector func(interface{}) interface{}) Query {
+	return Query{
+		Iterate: func() Iterator {
+			next := q.Iterate()
+
+			next2 := q2.Iterate()
+			set := make(map[interface{}]bool)
+			for i, ok := next2(); ok; i, ok = next2() {
+				s := selector(i)
+				set[s] = true
+			}
+
+			return func() (item interface{}, ok bool) {
+				for item, ok = next(); ok; item, ok = next() {
+					s := selector(item)
+					if _, has := set[s]; !has {
+						return
+					}
+				}
+
+				return
+			}
+		},
+	}
+}
+
+// ExceptByT is the typed version of ExceptBy.
+//
+//   - selectorFn is of type "func(TSource) TSource"
+//
+// NOTE: ExceptBy has better performance than ExceptByT.
+func (q Query) ExceptByT(q2 Query,
+	selectorFn interface{}) Query {
+	selectorGenericFunc, err := newGenericFunc(
+		"ExceptByT", "selectorFn", selectorFn,
+		simpleParamValidator(newElemTypeSlice(new(genericType)), newElemTypeSlice(new(genericType))),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	selectorFunc := func(item interface{}) interface{} {
+		return selectorGenericFunc.Call(item)
+	}
+
+	return q.ExceptBy(q2, selectorFunc)
+}