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# Hello World
Write a program that greets the user by name, or by saying "Hello, World!" if no name is given.
["Hello, World!"](http://en.wikipedia.org/wiki/%22Hello,_world!%22_program) 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](http://en.wikipedia.org/wiki/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:
1. Run the test file and pick one test that's failing.
2. Write some code to fix the test you picked.
3. Re-run the tests to confirm the test is now passing.
4. Repeat from step 1.
5. [Submit your solution](http://exercism.io/languages/erlang).
## 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.
## Running tests
```bash
$ erl -make
$ erl -noshell -eval "eunit:test(hello_world, [verbose])" -s init stop
```
## Source
This is a program to introduce users to using Exercism [view source](http://en.wikipedia.org/wiki/%22Hello,_world!%22_program)
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