exercism/ecmascript/hello-world/README.md

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2016-08-13 23:20:14 +00:00
# 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://help.exercism.io/submitting-exercises.html).
## 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.
## Setup
Go through the setup instructions for ECMAScript to
install the necessary dependencies:
http://help.exercism.io/getting-started-with-ecmascript.html
## Requirements
They are already described in the link above, but just as a
quick reference:
Install globally a tool to run [Gulp](http://gulpjs.com) if
it is not installed yet:
```bash
$ npm install -g gulp-cli
```
Install assignment dependencies:
```bash
$ npm install
```
## Making the test suite pass
Execute the tests with:
```bash
$ gulp test
```
In many test suites all but the first test have been skipped.
Once you get a test passing, you can unskip the next one by
changing `xit` to `it`.
## Source
This is a program to introduce users to using Exercism [view source](http://en.wikipedia.org/wiki/%22Hello,_world!%22_program)