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Mastering FizzBuzz using Ruby : A classic algorithm explained

   November 23, 2023
Ruby @ Freshers.in

FizzBuzz is a renowned coding challenge, often utilized in job interviews to gauge a candidate’s grasp of basic programming concepts. While simple in its essence, FizzBuzz is a perfect exercise for understanding loops and conditionals, especially in Ruby, a language known for its elegance and readability.

Understanding the FizzBuzz algorithm

The FizzBuzz algorithm involves iterating through numbers (usually from 1 to 100) and applying specific rules:

  • Print “Fizz” for numbers divisible by 3.
  • Print “Buzz” for numbers divisible by 5.
  • Print “FizzBuzz” for numbers divisible by both 3 and 5.
  • Print the number itself in all other cases.

The logic behind FizzBuzz

  1. Iteration: Looping through a series of numbers, which is typically done using Ruby’s each method.
  2. Conditionals: Applying if statements to determine whether the current number meets certain divisibility criteria.
  3. Output: Printing “Fizz”, “Buzz”, “FizzBuzz”, or the number based on the criteria met.

Implementing FizzBuzz in Ruby

Here’s how you can implement the FizzBuzz algorithm in Ruby:

(1..100).each do |i|
  if i % 3 == 0 && i % 5 == 0
    puts "FizzBuzz"
  elsif i % 3 == 0
    puts "Fizz"
  elsif i % 5 == 0
    puts "Buzz"
  else
    puts i
  end
end

Breaking down the code

  • (1..100).each do |i|: Iterates over numbers from 1 to 100. Each number is referred to as i.
  • if i % 3 == 0 && i % 5 == 0: Checks if i is divisible by both 3 and 5.
  • elsif i % 3 == 0: Checks if i is divisible by 3.
  • elsif i % 5 == 0: Checks if i is divisible by 5.
  • puts i: Prints the number itself if none of the above conditions are met.
  • end: Ends the conditional and loop blocks.

Testing the algorithm

To test the algorithm, run this Ruby script in a suitable environment. You’ll observe that for numbers like 3 and 6, “Fizz” is printed, for 5 and 10, “Buzz” is printed, for numbers like 15 and 30, “FizzBuzz” is printed, and for other numbers like 1, 2, and 4, the number itself is printed.

Output

1
2
Fizz
4
Buzz
Fizz
7
8
Fizz
Buzz
11
Fizz
13
14
FizzBuzz
16
17
Fizz
19
Buzz
Fizz
22
23
.
.
.

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