From 33abe87c5bcf9e3e41ca4030cdce63e7250c6870 Mon Sep 17 00:00:00 2001
From: Anton Kaliaev <anton.kalyaev@gmail.com>
Date: Wed, 29 Nov 2017 12:18:03 -0600
Subject: [PATCH] IntInSlice and StringInSlice functions

Refs https://github.com/tendermint/tendermint/pull/835
---
 common/int.go         | 10 ++++++++++
 common/int_test.go    | 14 ++++++++++++++
 common/string.go      | 10 ++++++++++
 common/string_test.go | 14 ++++++++++++++
 4 files changed, 48 insertions(+)
 create mode 100644 common/int_test.go
 create mode 100644 common/string_test.go

diff --git a/common/int.go b/common/int.go
index 756e38cd..a8a5f1e0 100644
--- a/common/int.go
+++ b/common/int.go
@@ -53,3 +53,13 @@ func PutInt64BE(dest []byte, i int64) {
 func GetInt64BE(src []byte) int64 {
 	return int64(binary.BigEndian.Uint64(src))
 }
+
+// IntInSlice returns true if a is found in the list.
+func IntInSlice(a int, list []int) bool {
+	for _, b := range list {
+		if b == a {
+			return true
+		}
+	}
+	return false
+}
diff --git a/common/int_test.go b/common/int_test.go
new file mode 100644
index 00000000..1ecc7844
--- /dev/null
+++ b/common/int_test.go
@@ -0,0 +1,14 @@
+package common
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIntInSlice(t *testing.T) {
+	assert.True(t, IntInSlice(1, []int{1, 2, 3}))
+	assert.False(t, IntInSlice(4, []int{1, 2, 3}))
+	assert.True(t, IntInSlice(0, []int{0}))
+	assert.False(t, IntInSlice(0, []int{}))
+}
diff --git a/common/string.go b/common/string.go
index 1ab91f15..6924e6a5 100644
--- a/common/string.go
+++ b/common/string.go
@@ -43,3 +43,13 @@ func StripHex(s string) string {
 	}
 	return s
 }
+
+// StringInSlice returns true if a is found the list.
+func StringInSlice(a string, list []string) bool {
+	for _, b := range list {
+		if b == a {
+			return true
+		}
+	}
+	return false
+}
diff --git a/common/string_test.go b/common/string_test.go
new file mode 100644
index 00000000..a82f1022
--- /dev/null
+++ b/common/string_test.go
@@ -0,0 +1,14 @@
+package common
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestStringInSlice(t *testing.T) {
+	assert.True(t, StringInSlice("a", []string{"a", "b", "c"}))
+	assert.False(t, StringInSlice("d", []string{"a", "b", "c"}))
+	assert.True(t, StringInSlice("", []string{""}))
+	assert.False(t, StringInSlice("", []string{}))
+}