Counting Words in a Sentence

To run the project

npm install
npm test

Create a method that, given a sentence, returns number of words in the sentence.

Follow the TDD rules:

• You can't write any production code until you have first written a failing unit test.
• You can't write more of a unit test than is sufficient to fail, and not compiling is failing.
• You can't write more production code than is sufficient to pass the currently failing unit test.

Follow the RGR cycle.

• Red - create a unit test that fails.
• Green - Write code that makes the test pass.
• Refactor - Clean up the mess you just made.

With the actual tests described below, try to not read ahead. Focus on the above and not on the final code.

1. Null string returns zero

Count(null) ==> returns 0

2. String consisting of whitespaces only returns zero

Count(" \n\n\t\r ") ==> returns 0

3. Single word returns one

Count("Hello") ==> returns 1

4. Two words separated by a space return two

Count("Hello world") ==> returns 2

5. Single word surrounded by any whitespaces returns one

Count("  \nHello  \r ") ==> returns 1

6. Words can be separated by any whitespace(s)

Count("Hello crazy \n  world") ==> returns 3

7. Count only unique words

Count("Hello world in world") ==> returns 3

8. Words are case insensitive

Count("Hello world hello") ==> returns 2

9. Trailing periods are ignored

Count("Hello world hello.") ==> returns 2

10. Any punctuation is ignored.

Count("Hello (world) - 123.") ==> returns 3

11. Words are accent insensitive.

Count("Allô? Allo est la fin.") ==> returns 4