Merge pull request #412 from openset/develop

Add: Reverse Words in a String

Author: Shuo

problems/reverse-words-in-a-string/reverse_words_in_a_string.go

@@ -1 +1,15 @@
 package reverse_words_in_a_string
+
+import (
+	"regexp"
+	"strings"
+)
+
+func reverseWords(s string) string {
+	reg := regexp.MustCompile(`\S+`)
+	words := reg.FindAllString(s, -1)
+	for i, j := 0, len(words)-1; i < j; i, j = i+1, j-1 {
+		words[i], words[j] = words[j], words[i]
+	}
+	return strings.Join(words, " ")
+}

problems/reverse-words-in-a-string/reverse_words_in_a_string_test.go

@@ -1 +1,31 @@
 package reverse_words_in_a_string
+
+import "testing"
+
+type caseType struct {
+	input    string
+	expected string
+}
+
+func TestReverseWords(t *testing.T) {
+	tests := [...]caseType{
+		{
+			input:    "the sky is blue",
+			expected: "blue is sky the",
+		},
+		{
+			input:    "  hello world!  ",
+			expected: "world! hello",
+		},
+		{
+			input:    "a good   example",
+			expected: "example good a",
+		},
+	}
+	for _, tc := range tests {
+		output := reverseWords(tc.input)
+		if output != tc.expected {
+			t.Fatalf("input: %v, output: %v, expected: %v", tc.input, output, tc.expected)
+		}
+	}
+}