1 files changed, 147 insertions, 0 deletions
diff --git a/lib/strings/strings_example_test.go b/lib/strings/strings_example_test.go
new file mode 100644
index 00000000..d661232a
--- /dev/null
+++ b/lib/strings/strings_example_test.go
@@ -0,0 +1,147 @@
+// Copyright 2018, Shulhan <ms@kilabit.info>. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package strings
+
+import (
+	"fmt"
+)
+
+func ExampleCountMissRate() {
+	src := []string{"A", "B", "C", "D"}
+	tgt := []string{"A", "B", "C", "D"}
+	fmt.Println(CountMissRate(src, tgt))
+
+	src = []string{"A", "B", "C", "D"}
+	tgt = []string{"B", "B", "C", "D"}
+	fmt.Println(CountMissRate(src, tgt))
+
+	src = []string{"A", "B", "C", "D"}
+	tgt = []string{"B", "C", "C", "D"}
+	fmt.Println(CountMissRate(src, tgt))
+
+	src = []string{"A", "B", "C", "D"}
+	tgt = []string{"B", "C", "D", "D"}
+	fmt.Println(CountMissRate(src, tgt))
+
+	src = []string{"A", "B", "C", "D"}
+	tgt = []string{"C", "D", "D", "E"}
+	fmt.Println(CountMissRate(src, tgt))
+
+	// Output:
+	// 0 0 4
+	// 0.25 1 4
+	// 0.5 2 4
+	// 0.75 3 4
+	// 1 4 4
+}
+
+func ExampleCountToken() {
+	words := []string{"A", "B", "C", "a", "b", "c"}
+	fmt.Println(CountToken(words, "C", false))
+	fmt.Println(CountToken(words, "C", true))
+	// Output:
+	// 2
+	// 1
+}
+
+func ExampleCountTokens() {
+	words := []string{"A", "B", "C", "a", "b", "c"}
+	tokens := []string{"A", "B"}
+	fmt.Println(CountTokens(words, tokens, false))
+	fmt.Println(CountTokens(words, tokens, true))
+	// Output:
+	// [2 2]
+	// [1 1]
+}
+
+func ExampleFrequencyOfToken() {
+	words := []string{"A", "B", "C", "a", "b", "c"}
+	fmt.Println(FrequencyOfToken(words, "C", false))
+	fmt.Println(FrequencyOfToken(words, "C", true))
+	// Output:
+	// 0.3333333333333333
+	// 0.16666666666666666
+
+}
+
+func ExampleFrequencyOfTokens() {
+	words := []string{"A", "B", "C", "a", "b", "c"}
+	tokens := []string{"A", "B"}
+	fmt.Println(FrequencyOfTokens(words, tokens, false))
+	fmt.Println(FrequencyOfTokens(words, tokens, true))
+	// Output:
+	// [0.3333333333333333 0.3333333333333333]
+	// [0.16666666666666666 0.16666666666666666]
+}
+
+func ExampleIsEqual() {
+	fmt.Println(IsEqual([]string{"a", "b"}, []string{"a", "b"}))
+	fmt.Println(IsEqual([]string{"a", "b"}, []string{"b", "a"}))
+	fmt.Println(IsEqual([]string{"a", "b"}, []string{"a"}))
+	fmt.Println(IsEqual([]string{"a", "b"}, []string{"b", "b"}))
+	// Output:
+	// true
+	// true
+	// false
+	// false
+}
+
+func ExampleLongest() {
+	words := []string{"a", "bb", "ccc", "d", "eee"}
+	fmt.Println(Longest(words))
+	// Output: ccc 2
+}
+
+func ExampleMostFrequentTokens() {
+	words := []string{"a", "b", "B", "B", "a"}
+	tokens := []string{"a", "b"}
+	fmt.Println(MostFrequentTokens(words, tokens, false))
+	fmt.Println(MostFrequentTokens(words, tokens, true))
+	// Output:
+	// b
+	// a
+}
+
+func ExampleSortByIndex() {
+	dat := []string{"Z", "X", "C", "V", "B", "N", "M"}
+	ids := []int{4, 2, 6, 5, 3, 1, 0}
+
+	fmt.Println(dat)
+	SortByIndex(&dat, ids)
+	fmt.Println(dat)
+	// Output:
+	// [Z X C V B N M]
+	// [B C M N V X Z]
+}
+
+func ExampleSwap() {
+	ss := []string{"a", "b", "c"}
+	Swap(ss, -1, 1)
+	fmt.Println(ss)
+	Swap(ss, 1, -1)
+	fmt.Println(ss)
+	Swap(ss, 4, 1)
+	fmt.Println(ss)
+	Swap(ss, 1, 4)
+	fmt.Println(ss)
+	Swap(ss, 1, 2)
+	fmt.Println(ss)
+	// Output:
+	// [a b c]
+	// [a b c]
+	// [a b c]
+	// [a b c]
+	// [a c b]
+}
+
+func ExampleTotalFrequencyOfTokens() {
+	words := []string{"A", "B", "C", "a", "b", "c"}
+	tokens := []string{"A", "B"}
+	fmt.Println(TotalFrequencyOfTokens(words, tokens, false))
+	fmt.Println(TotalFrequencyOfTokens(words, tokens, true))
+	// Output:
+	// 0.6666666666666666
+	// 0.3333333333333333
+}