programming-elixir-ch5-fizz-buzz.ex

# FizzBuzz - Write a program that prints the numbers from 1 to 100. But for multiples of 3, print "Fizz" instead of the number and for the multiples of 5, print "Buzz". For numbers which are multiples of both 3 and 5, print "FizzBuzz".

# First, the JavaScript implementation

const fizzBuzz = (num) => {
   if (num % 3 === 0 && num % 5 === 0) return "FizzBuzz";
   if (num % 3 === 0) return "Fizz";
   if (num % 5 === 0) return "Buzz";
   return num;
};

const range = (num) => [ ...Array(num).keys() ].map(num => num + 1); # This helper function simply creates an array of numbers - i.e range(100) == [1, 2, 3, ..., 100]

console.log(range(100).map(fizzBuzz));

# Next, the Elixir implementation

fizz_buzz_result = fn 
  (0, 0, _) -> "FizzBuzz"
  (0, _, _) -> "Fizz"
  (_, 0, _) -> "Buzz"
  (_, _, num) -> num
end

fizz_buzz = fn (num) -> fizz_buzz_result.(rem(num, 3), rem(num, 5), num) end

IO.puts(Enum.map(1..100, fizz_buzz)) 

# I think one of the most interesting aspects of the Elixir implementation is that there is NO conditional logic involved. 
# Instead of using `if / else` logic, Elixir takes advantage of pattern matching and multiple clauses to produce the same effect!