2.0 KiB
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.
Running tests
$ elixir bob_test.exs
(Replace bob_test.exs with the name of the test file.)
Source
This is a program to introduce users to using Exercism view source