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We are working towards making exercises stand-alone. That is to say: no more generating READMEs on the fly. This will give maintainers more control over each individual exercise README, and it will also make some of the backend logic for delivering exercises simpler. The README template uses the Go text/template package, and the default templates generate the same READMEs as we have been generating on the fly. See the documentation in [regenerating exercise readmes][regenerate-docs] for details. The READMEs can be generated at any time using a new 'generate' command in configlet. This command has not yet landed in master or been released, but can be built from source in the generate-readmes branch on [configlet][]. [configlet]: https://github.com/exercism/configlet [regenerate-docs]: https://github.com/exercism/docs/blob/master/maintaining-a-track/regenerating-exercise-readmes.md
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Say
Given a number from 0 to 999,999,999,999, spell out that number in English.
Step 1
Handle the basic case of 0 through 99.
If the input to the program is 22, then the output should be
'twenty-two'.
Your program should complain loudly if given a number outside the blessed range.
Some good test cases for this program are:
- 0
- 14
- 50
- 98
- -1
- 100
Extension
If you're on a Mac, shell out to Mac OS X's say program to talk out
loud.
Step 2
Implement breaking a number up into chunks of thousands.
So 1234567890 should yield a list like 1, 234, 567, and 890, while the
far simpler 1000 should yield just 1 and 0.
The program must also report any values that are out of range.
Step 3
Now handle inserting the appropriate scale word between those chunks.
So 1234567890 should yield '1 billion 234 million 567 thousand 890'
The program must also report any values that are out of range. It's fine to stop at "trillion".
Step 4
Put it all together to get nothing but plain English.
12345 should give twelve thousand three hundred forty-five.
The program must also report any values that are out of range.
Extensions
Use and (correctly) when spelling out the number in English:
- 14 becomes "fourteen".
- 100 becomes "one hundred".
- 120 becomes "one hundred and twenty".
- 1002 becomes "one thousand and two".
- 1323 becomes "one thousand three hundred and twenty-three".
Elm Installation
Refer to the Exercism help page for Elm installation and learning resources.
Writing the Code
The first time you start an exercise, you'll need to ensure you have the appropriate dependencies installed.
$ npm install
Execute the tests with:
$ npm test
Automatically run tests again when you save changes:
$ npm run watch
As you work your way through the test suite, be sure to remove the skip <|
calls from each test until you get them all passing!
Source
A variation on JavaRanch CattleDrive, exercise 4a http://www.javaranch.com/say.jsp
Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.