From 1db2191a2bb7c8cb1d5d8fe493a6456d7a136ca7 Mon Sep 17 00:00:00 2001
From: Ulric Qin <ulric.qin@gmail.com>
Date: Mon, 3 Dec 2018 22:27:43 +0800
Subject: [PATCH] code refactor

---
 list/list.go | 28 ---------------------------
 slice/sub.go | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+), 28 deletions(-)
 delete mode 100644 list/list.go
 create mode 100644 slice/sub.go

diff --git a/list/list.go b/list/list.go
deleted file mode 100644
index 62eaa9e..0000000
--- a/list/list.go
+++ /dev/null
@@ -1,28 +0,0 @@
-package list
-
-// Sub: a-b=?
-func Sub(a, b []int64) []int64 {
-	blen := len(b)
-	if blen == 0 {
-		return a
-	}
-
-	alen := len(a)
-	if alen == 0 {
-		return a
-	}
-
-	bset := make(map[int64]struct{}, blen)
-	for i := 0; i < blen; i++ {
-		bset[b[i]] = struct{}{}
-	}
-
-	ret := make([]int64, 0, alen)
-	for i := 0; i < alen; i++ {
-		if _, has := bset[a[i]]; !has {
-			ret = append(ret, a[i])
-		}
-	}
-
-	return ret
-}
diff --git a/slice/sub.go b/slice/sub.go
new file mode 100644
index 0000000..39d933d
--- /dev/null
+++ b/slice/sub.go
@@ -0,0 +1,54 @@
+package slice
+
+// Sub: a-b=?
+func SubInt64(a, b []int64) []int64 {
+	blen := len(b)
+	if blen == 0 {
+		return a
+	}
+
+	alen := len(a)
+	if alen == 0 {
+		return a
+	}
+
+	bset := make(map[int64]struct{}, blen)
+	for i := 0; i < blen; i++ {
+		bset[b[i]] = struct{}{}
+	}
+
+	ret := make([]int64, 0, alen)
+	for i := 0; i < alen; i++ {
+		if _, has := bset[a[i]]; !has {
+			ret = append(ret, a[i])
+		}
+	}
+
+	return ret
+}
+
+func SubString(a, b []string) []string {
+	blen := len(b)
+	if blen == 0 {
+		return a
+	}
+
+	alen := len(a)
+	if alen == 0 {
+		return a
+	}
+
+	bset := make(map[string]struct{}, blen)
+	for i := 0; i < blen; i++ {
+		bset[b[i]] = struct{}{}
+	}
+
+	ret := make([]string, 0, alen)
+	for i := 0; i < alen; i++ {
+		if _, has := bset[a[i]]; !has {
+			ret = append(ret, a[i])
+		}
+	}
+
+	return ret
+}