Hello World

Write a program that greets the user by name, or by saying "Hello, World!" if no name is given.

"Hello, World!" is the traditional first program for beginning programming in a new language.

Note: You can skip this exercise by running:

exercism skip $LANGUAGE hello-world

Specification

The Hello World! program will greet me, the caller.

If I tell the program my name is Alice, it will greet me by saying "Hello, Alice!".

If I neglect to give it my name, it will greet me by saying "Hello, World!"

Test-Driven Development

As programmers mature, they eventually want to test their code.

Here at Exercism we simulate Test-Driven Development (TDD), where you write your tests before writing any functionality. The simulation comes in the form of a pre-written test suite, which will signal that you have solved the problem.

It will also provide you with a safety net to explore other solutions without breaking the functionality.

A typical TDD workflow on Exercism:

Run the test file and pick one test that's failing.
Write some code to fix the test you picked.
Re-run the tests to confirm the test is now passing.
Repeat from step 1.
Submit your solution.

Instructions

Submissions are encouraged to be general, within reason. Having said that, it's also important not to over-engineer a solution.

It's important to remember that the goal is to make code as expressive and readable as we can. However, solutions to the hello-world exercise will be not be reviewed by a person, but by rikki- the robot, who will offer an encouraging word.

For learning resources and help with installation, refer to the Exercism help page.

To run the tests provided, you will need to install Leiningen.

To install Leiningen on Mac OS X using Homebrew, run the following command:

brew install leiningen

For help installing on Linux, Windows or without Homebrew see: Leiningen installation.

In an exercise directory, create a src directory and a file therein to hold your solution. The name of the file should be the exercise name with dashes - replaced by underscores _. For example, if the exercise is called hello-world, name the solution file hello_world.clj.

Your resulting file tree should look something like this:

/path/to/hello-world
├── project.clj
├── src
│   └── hello_world.clj
└── test
    └── hello_world_test.clj

To run the tests, navigate to the exercise directory and run the following command:

lein test

Source

This is a program to introduce users to using Exercism view source

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