add

util/common/array.go

@@ -0,0 +1,45 @@
+package common
+
+// UnionUintArray returns a new unique slice that contains all elements from both input slices
+func UnionUintArray(a []uint, b []uint) []uint {
+	m := make(map[uint]bool)
+	for _, v := range a {
+		m[v] = true
+	}
+	for _, v := range b {
+		m[v] = true
+	}
+	var res []uint
+	for k := range m {
+		res = append(res, k)
+	}
+	return res
+}
+
+// Find different elements in two slices
+// Returns elements in 'a' that are not in 'b' and elements in 'b' that are not in 'a'
+func DiffUintArray(a []uint, b []uint) []uint {
+	different := []uint{}
+	set := make(map[uint]bool)
+
+	for _, item := range a {
+		set[item] = true
+	}
+	for _, item := range b {
+		if !set[item] {
+			different = append(different, item)
+		}
+	}
+
+	set = make(map[uint]bool)
+	for _, item := range b {
+		set[item] = true
+	}
+	for _, item := range a {
+		if !set[item] {
+			different = append(different, item)
+		}
+	}
+
+	return different
+}