Solve reverse string

go/reverse-string/.exercism/metadata.json

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+{"track":"go","exercise":"reverse-string","id":"f27c25aede524216a6d09c355d619b5d","url":"https://exercism.io/my/solutions/f27c25aede524216a6d09c355d619b5d","handle":"rootulp","is_requester":true,"auto_approve":false}

go/reverse-string/README.md

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+# Reverse String
+
+Reverse a string
+
+For example:
+input: "cool"
+output: "looc"
+
+## Coding the solution
+
+Look for a stub file having the name reverse_string.go
+and place your solution code in that file.
+
+## Running the tests
+
+To run the tests run the command `go test` from within the exercise directory.
+
+If the test suite contains benchmarks, you can run these with the `--bench` and `--benchmem`
+flags:
+
+    go test -v --bench . --benchmem
+
+Keep in mind that each reviewer will run benchmarks on a different machine, with
+different specs, so the results from these benchmark tests may vary.
+
+## Further information
+
+For more detailed information about the Go track, including how to get help if
+you're having trouble, please visit the exercism.io [Go language page](http://exercism.io/languages/go/resources).
+
+## Source
+
+Introductory challenge to reverse an input string [https://medium.freecodecamp.org/how-to-reverse-a-string-in-javascript-in-3-different-ways-75e4763c68cb](https://medium.freecodecamp.org/how-to-reverse-a-string-in-javascript-in-3-different-ways-75e4763c68cb)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

go/reverse-string/cases_test.go

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+package reverse
+
+// Source: exercism/problem-specifications
+// Commit: 6c95c2e reverse-string: Add a test with an even-sized word (#1519)
+// Problem Specifications Version: 1.2.0
+
+type reverseTestCase struct {
+	description string
+	input       string
+	expected    string
+}
+
+var testCases = []reverseTestCase{
+	{
+		description: "an empty string",
+		input:       "",
+		expected:    "",
+	},
+	{
+		description: "a word",
+		input:       "robot",
+		expected:    "tobor",
+	},
+	{
+		description: "a capitalized word",
+		input:       "Ramen",
+		expected:    "nemaR",
+	},
+	{
+		description: "a sentence with punctuation",
+		input:       "I'm hungry!",
+		expected:    "!yrgnuh m'I",
+	},
+	{
+		description: "a palindrome",
+		input:       "racecar",
+		expected:    "racecar",
+	},
+	{
+		description: "an even-sized word",
+		input:       "drawer",
+		expected:    "reward",
+	},
+}

go/reverse-string/go.mod

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+module reverse
+
+go 1.13

go/reverse-string/reverse_string.go

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+package reverse
+
+import (
+	"strings"
+)
+
+// Reverse returns a string with characters in reversed order.
+func Reverse(s string) string {
+	chars := strings.Split(s, "")
+	result := make([]string, len(s))
+
+	for i := len(chars) - 1; i >= 0; i-- {
+		result = append(result, chars[i])
+	}
+	return strings.Join(result, "")
+}

go/reverse-string/reverse_string_test.go

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+package reverse
+
+import (
+	"testing"
+	"testing/quick"
+)
+
+func TestReverse(t *testing.T) {
+	for _, testCase := range append(testCases, multiByteCases...) {
+		if res := Reverse(testCase.input); res != testCase.expected {
+			t.Fatalf("FAIL: %s(%s)\nExpected: %q\nActual: %q",
+				testCase.description, testCase.input, testCase.expected, res)
+		}
+		t.Logf("PASS: %s", testCase.description)
+	}
+}
+
+func TestReverseOfReverse(t *testing.T) {
+	assertion := func(s string) bool {
+		return s == Reverse(Reverse(s))
+	}
+	if err := quick.Check(assertion, nil); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func BenchmarkReverse(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		for _, test := range testCases {
+			Reverse(test.input)
+		}
+	}
+}
+
+// mutiByteCases adds UTF-8 multi-byte case,
+// since the canonical-data.json (generator data source for cases_test.go)
+// doesn't have any such cases.
+var multiByteCases = []reverseTestCase{
+	{
+		description: "a multi-byte test case",
+		input:       "Hello, 世界",
+		expected:    "界世 ,olleH",
+	},
+}