From cf5b98a0d410bb975ffc72c086c929b68d965ab2 Mon Sep 17 00:00:00 2001
From: Shulhan <ms@kilabit.info>
Date: Fri, 24 May 2019 22:30:51 +0700
Subject: strings: add function to append uniq values to slice of strings

The AppendUniq will append a string to slice only if the same string
its not already exist.  The string is compared in case insensitive manner.
---
 lib/strings/strings.go              | 24 ++++++++++++++++++++++++
 lib/strings/strings_example_test.go | 11 +++++++++++
 2 files changed, 35 insertions(+)

diff --git a/lib/strings/strings.go b/lib/strings/strings.go
index c78ea788..d1e11fe8 100644
--- a/lib/strings/strings.go
+++ b/lib/strings/strings.go
@@ -14,6 +14,30 @@ import (
 	"github.com/shuLhan/share/lib/ints"
 )
 
+//
+// AppendUniq append case-insensitive strings to slice of input without
+// duplicate.
+//
+func AppendUniq(in []string, vals ...string) []string {
+	var found bool
+
+	for x := 0; x < len(vals); x++ {
+		found = false
+		for y := 0; y < len(in); y++ {
+			if vals[x] == in[y] {
+				found = true
+				break
+			}
+		}
+		if found {
+			continue
+		}
+		in = append(in, vals[x])
+	}
+
+	return in
+}
+
 //
 // CountMissRate given two slice of string, count number of string that is
 // not equal with each other, and return the miss rate as
diff --git a/lib/strings/strings_example_test.go b/lib/strings/strings_example_test.go
index d661232a..df2f5125 100644
--- a/lib/strings/strings_example_test.go
+++ b/lib/strings/strings_example_test.go
@@ -8,6 +8,17 @@ import (
 	"fmt"
 )
 
+func ExampleAppendUniq() {
+	in := []string{"a", "", "b", "c"}
+	vals := []string{"b", "", "C", "d"}
+
+	in = AppendUniq(in, vals...)
+
+	fmt.Println(in)
+	// Output:
+	// [a  b c C d]
+}
+
 func ExampleCountMissRate() {
 	src := []string{"A", "B", "C", "D"}
 	tgt := []string{"A", "B", "C", "D"}
-- 
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