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FizzBuzz - part 1

 What is FizzBuzz

FizzBuzz is a simple programming exercise that is frequently used as a white board problem during interviews.  I, personally, have never used this problem or had anyone ask it of me during an interview so your mileage  may vary.

I was inspired to write this sequence after getting Poly Bridge 2 as a Christmas gift.  As I was watching some of the truly intricate bridge designs on YouTube, I also ran across a FizzBuzz video (no, I have no idea why Google put them together as a recommendation).  What, I thought to myself, would happen if I took the simple FizzBuzz to the same levels as Tyler and Arglin Kampling.

I plan to discuss a progression of FizzBuzz from what I would expect from an entry level developer to an enterprise architect.  Since I'm playing both sides of this, I don't expect anyone else will make the same choices as I do - what's important is the journey.

The initial solution:

package dev.boundary.waters.FizzBuzz;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MySpringBootApplication {

/**
* A canonical FizzBuzz implementation.
* 
* Write a program that prints the numbers from 1 to 100. 
* But for multiples of three print “Fizz” 
         * instead of the number.
* For the multiples of five print “Buzz”. 
* For numbers which are multiples of both three and 
         * five print “FizzBuzz”.
* 
*/
public static void fizzBuzz() {
for(int i = 1; i < 101; i++) {
boolean isFactorThree = ((i % 3) == 0);
boolean isFactorFive = ((i % 5) == 0);
if(isFactorThree && isFactorFive) {
System.out.println("FizzBuzz");
} else if(isFactorThree) {
System.out.println("Fizz");
} else if(isFactorFive) {
System.out.println("Buzz");
} else {
System.out.println(i);
}
}
}
    /**
     * A main method to start this application.
     * The spring boot call is commented out for now.
     */
    public static void main(String[] args) {
        fizzBuzz();
        // SpringApplication.run(MySpringBootApplication.class, args);
    }
}

What's important in the solution:

  • This is a basic program that has:
    1. Input (ranging from 1 to 100)
    2. Processing ( the FizzBuzz rules)
    3. Output
  • The programmer needs understand operators in order to determine the remainder when dividing by 3 and 5.
  • They also need to understand that you have to check the AND condition before the other two options.
  • The input and output are currently hard coded, which in general is a poor choice.

What's less important in the solution:

  • First, because I'm planning on extending this solution, all of the references to SpringBoot and Apache Camel in the project is just so I don't have to re-generate my solution for other parts of the discussion.
  • Did they factor out the boolean modulus operators?  As developers get more experience, they find that naming things for the intent (i.e. is it divisible by 3 or 5) is important to communicate to the reader.  But on a white board where space isn't infinite, putting it in the if statement would be fine.
  • All of the other things that could be put in the solution.  I will discuss what I would put in, but it's going to go past what a white board could hold and I would do hand wavy lists if I were being asked what more to add.+

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