hello-world
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{
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"authors": [
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"k4rtik"
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],
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"contributors": [
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"bitfield",
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"ekingery",
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"ferhatelmas",
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"hilary",
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"kytrinyx",
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"leenipper",
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"petertseng",
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"robphoenix",
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"SebastianKristof",
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"sebito91",
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"tleen"
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],
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"files": {
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"solution": [
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"hello_world.go"
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],
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"test": [
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"hello_world_test.go"
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],
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"example": [
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".meta/example.go"
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],
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"invalidator": [
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"go.mod"
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]
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},
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"blurb": "The classical introductory exercise. Just say \"Hello, World!\".",
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"source": "This is an exercise to introduce users to using Exercism",
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"source_url": "https://en.wikipedia.org/wiki/%22Hello,_world!%22_program"
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}
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{"track":"go","exercise":"hello-world","id":"d4f5f27839e94f75a117c66838248852","url":"https://exercism.org/tracks/go/exercises/hello-world","handle":"negrienko","is_requester":true,"auto_approve":false}
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# Help
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## Running the tests
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To run the tests run the command `go test` from within the exercise directory.
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If the test suite contains benchmarks, you can run these with the `--bench` and `--benchmem`
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flags:
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go test -v --bench . --benchmem
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Keep in mind that each reviewer will run benchmarks on a different machine, with
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different specs, so the results from these benchmark tests may vary.
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## Submitting your solution
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You can submit your solution using the `exercism submit hello_world.go` command.
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This command will upload your solution to the Exercism website and print the solution page's URL.
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It's possible to submit an incomplete solution which allows you to:
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- See how others have completed the exercise
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- Request help from a mentor
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## Need to get help?
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If you'd like help solving the exercise, check the following pages:
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- The [Go track's documentation](https://exercism.org/docs/tracks/go)
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- The [Go track's programming category on the forum](https://forum.exercism.org/c/programming/go)
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- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
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- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
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Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
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To get help if you're having trouble, you can use one of the following resources:
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- [How to Write Go Code](https://golang.org/doc/code.html)
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- [Effective Go](https://golang.org/doc/effective_go.html)
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- [Go Resources](http://golang.org/help)
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- [StackOverflow](http://stackoverflow.com/questions/tagged/go)
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# Hello World
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Welcome to Hello World on Exercism's Go Track.
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If you need help running the tests or submitting your code, check out `HELP.md`.
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## Instructions
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The classical introductory exercise.
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Just say "Hello, World!".
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["Hello, World!"][hello-world] is the traditional first program for beginning programming in a new language or environment.
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The objectives are simple:
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- Modify the provided code so that it produces the string "Hello, World!".
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- Run the test suite and make sure that it succeeds.
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- Submit your solution and check it at the website.
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If everything goes well, you will be ready to fetch your first real exercise.
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[hello-world]: https://en.wikipedia.org/wiki/%22Hello,_world!%22_program
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## Source
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### Created by
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- @k4rtik
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### Contributed to by
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- @bitfield
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- @ekingery
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- @ferhatelmas
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- @hilary
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- @kytrinyx
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- @leenipper
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- @petertseng
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- @robphoenix
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- @SebastianKristof
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- @sebito91
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- @tleen
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### Based on
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This is an exercise to introduce users to using Exercism - https://en.wikipedia.org/wiki/%22Hello,_world!%22_program
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module greeting
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go 1.18
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package greeting
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// HelloWorld greets the world.
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func HelloWorld() string {
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return "Hello, World!"
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}
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package greeting
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import "testing"
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// Define a function named HelloWorld that takes no arguments,
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// and returns a string.
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// In other words, define a function with the following signature:
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// HelloWorld() string
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func TestHelloWorld(t *testing.T) {
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expected := "Hello, World!"
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if observed := HelloWorld(); observed != expected {
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t.Fatalf("HelloWorld() = %v, want %v", observed, expected)
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}
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}
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// BenchmarkHelloWorld() is a benchmarking function. These functions follow the
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// form `func BenchmarkXxx(*testing.B)` and can be used to test the performance
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// of your implementation. They may not be present in every exercise, but when
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// they are you can run them by including the `-bench` flag with the `go test`
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// command, like so: `go test -v --bench . --benchmem`
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//
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// You will see output similar to the following:
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//
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// BenchmarkHelloWorld 2000000000 0.46 ns/op
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//
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// This means that the loop ran 2000000000 times at a speed of 0.46 ns per loop.
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//
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// While benchmarking can be useful to compare different iterations of the same
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// exercise, keep in mind that others will run the same benchmarks on different
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// machines, with different specs, so the results from these benchmark tests may
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// vary.
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func BenchmarkHelloWorld(b *testing.B) {
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if testing.Short() {
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b.Skip("skipping benchmark in short mode.")
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}
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for i := 0; i < b.N; i++ {
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HelloWorld()
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}
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}
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