FizzBuzz Kata

developer machine setup

mac operating system

• open the terminal
• install nvm, node, npm, yarn using the following commands:

touch ~/.bash_profile
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.0/install.sh | bash
source ~/.bash_profile
nvm install v7.5.0
npm install -g npm
npm install -g yarn

install

git clone https://github.com/raydecastro/fizzbuzz-kata.git
cd fizzbuzz-kata
yarn

test

npm test

automatic test

npm run test-auto

build

npm run build

shell scripts

test

./test.sh

build

./build.sh

technologies

• javascript
• es6 + babel
• mocha + chai
• nvm + node + npm + yarn
• gulp

Level

• Beginner

Skills

• Test Driven Development (TDD)
• Open Closed Principle (OCP)

Instructions

• Write a program that prints the numbers from 1 to 100.
• But for multiples of three print “Fizz” instead of the number and for the multiples of five print “Buzz”.
• For numbers which are multiples of both three and five print “FizzBuzz”.

Expected Output

1 2 Fizz 4 Buzz Fizz 7 8 Fizz Buzz 11 Fizz 13 14 FizzBuzz 16 17 Fizz 19 Buzz Fizz 22 23 Fizz Buzz 26 Fizz 28 29 FizzBuzz 31 32 Fizz 34 Buzz Fizz 37 38 Fizz Buzz 41 Fizz 43 44 FizzBuzz 46 47 Fizz 49 Buzz Fizz 52 53 Fizz Buzz 56 Fizz 58 59 FizzBuzz 61 62 Fizz 64 Buzz Fizz 67 68 Fizz Buzz 71 Fizz 73 74 FizzBuzz 76 77 Fizz 79 Buzz Fizz 82 83 Fizz Buzz 86 Fizz 88 89 FizzBuzz 91 92 Fizz 94 Buzz Fizz 97 98 Fizz Buzz

Additional Instructions

• When you’ve got it all working for “Fizz” and “Buzz”, add “Whizz” for multiples of seven
• Then add “Fizz” also for all numbers containing a 3 (eg 23, 53)

Retrospective

• Is the code you have written clean? Are there any smells?
• Did you refactor throughout or do it all at the end?
• What if a new requirement came along that multiples of seven were “Whizz”? Could you add that without editing the existing code? (Cue discussion of the Open Closed Principle)

References

• Emily Bache. The Coding Dojo Handbook. A practical guide to creating space where good programmers can become great programmers.