Spoiler alert: I am a true novice. Tasked with figuring out fizz buzz in
ruby for a class and while I have found more than a few versions of code
that solve the problem, my understanding is so rudimentary that I cannot
figure out how these examples truly work.
First question(refer to spoiler alert if you laugh out loud at this):
How do i print out numbers one through 100 in Ruby?
Second question: can 'if else" be used to solve this? My failed code is
below(attachment has screen shot):
puts('Lets play fizzbuzz')
print('enter a number: ')
number = gets()
puts(number)
if number == % 3
puts ('fizz')
elsif number == % 5
puts ('buzz')
elsif number == %15
puts ('fizzbuzz')
end
Thanks,
Thats ok being a novice, we all have to start somewhere right? Ruby is lovely as it get us to use blocks all the time, so to count to 100 you can use several methods on fixnum, look at the docs for more. Here is one example which might help you;
1.upto 100 do |number|
puts number
end
For your second question maybe take a quick look at the small implementation i whipped up for you, it hopefully might help you understand this problem:
1.upto 100 do |i|
string = ""
string += "Fizz" if i % 3 == 0
string += "Buzz" if i % 5 == 0
puts "#{i} = #{string}"
end
First question: this problem has several solutions. For example,
10.times { |i| puts i+1 }
For true novice: https://github.com/bbatsov/ruby-style-guide
another method that can be helpful :
puts (1..100).map {|i|
f = i % 3 == 0 ? 'Fizz' : nil
b = i % 5 == 0 ? 'Buzz' : nil
f || b ? "#{ f }#{ b }" : i
}
As a one liner
(1..100).map { |i| (i % 15).zero? ? 'FizzBuzz' : (i % 3).zero? ? 'Fizz' : (i % 5).zero? ? 'Buzz' : i }
In Regards to your failed code, your conditional statements should be like this:
if number % 3 == 0
puts "Fizz"
end
if number % 5 == 0
puts "Buzz"
end
You don't want the last elsif statement because it will never get executed
(if a number is not divisible by 3 or divisible by 5, then it is certainly not divisible by 15)
Adjust for this by changing the second elsif to simply and if and if the number is divisble by 5 and not by 3, then Fizz will not be outputted but Buzz Will be
I'm just showing you how to correct your code, but as others have pointed out, there are far more elegant solutions in Ruby.
Not the most beautiful way to write it but good for beginners and for readability.
def fizzbuzz(n)
(1..n).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
end
fizzbuzz(100)
1.upto(100).each do |x| # Question #1 The 'upto' method here takes is
# what you would use to count in a range.
if (x % 3 == 0) && (x % 5 == 0)
puts " Fizzbuzz"
elsif x % 3 == 0
puts " Fizz"
elsif x % 5 == 0
puts " Buzz"
else
puts x
end
end
Question #2 Yes you can but I would look for a more elegant way to write this as a part of a definition like
def fizzbuzz(last_number)
1.upto(last_number).each do |x|
if (x % 3 == 0) && (x % 5 == 0)
puts " Fizzbuzz"
elsif x % 3 == 0
puts " Fizz"
elsif x % 5 == 0
puts " Buzz"
else
puts x
end
end
end
This is the answer that helped me to understand that no variables are being created with the .each method. Sorry about my indenting. Still learning how to use Stackoverflow text editing.
As for a more complex solution, that's one way you could build
a simple DSL for quickly modifying the FizzBuzz programme (adding new divisors with their own keywords)
class FizzBuzzer
# #return [Hash{String, Symbol => Integer}]
attr_reader :keywords
# #param keywords [Hash{String, Symbol => Integer}]
def initialize(keywords)
#keywords = keywords
end
# #param range [Range]
# #return [void]
def call(range)
range.each do |num|
msg = ''
#keywords.each do |name, divisor|
msg << name.to_s if (num % divisor).zero?
end
msg = num if msg.empty?
puts msg
end
puts
end
end
# create a fizz buzzer with custom keywords for divisors
CLASSIC_FIZZ_BUZZER = FizzBuzzer.new Fizz: 3, Buzz: 5
# print for a particular range
CLASSIC_FIZZ_BUZZER.call(1..25)
# you can easily define an extended fizz buzzer
EXTENDED_FIZZ_BUZZER = FizzBuzzer.new Fizz: 3, Buzz: 5, Bazz: 7, Fuzz: 11 # print 'Fuzz' when divisible by 11
EXTENDED_FIZZ_BUZZER.call(1..25)
Here's a quite elegant solution.
(1..100).each do |num|
msg = ''
msg << 'Fizz' if (num % 3).zero?
msg << 'Buzz' if (num % 5).zero?
msg = num if msg.empty?
puts(msg)
end
It can be even more compact
(1..100).each do |num|
(msg ||= '') << 'Fizz' if (num % 3).zero?
(msg ||= '') << 'Buzz' if (num % 5).zero?
puts msg || num
end
FizzBuzz
(1..100).each do |num|
if num % 3 == 0 && num % 5 == 0
puts "#{num}. FIZZBUZZ!"
elsif num % 3 == 0
puts "#{num}. FIZZ!"
elsif num % 5 == 0
puts "#{num}. BUZZ!"
else
puts "#{num}."
end
end
First question:
for i in 1..100
puts i
end
Here is my most "idiomatic ruby" solution:
class FizzBuzz
def perform
iterate_to(100) do |num,out|
out += "Fizz" if num.divisable_by?(3)
out += "Buzz" if num.divisable_by?(5)
out || num
end
end
def iterate_to(max)
(1..max).each do |num|
puts yield num,nil
end
end
end
class Fixnum
def divisable_by?(num)
self % num == 0
end
end
class NilClass
def +(other)
other
end
end
FizzBuzz.new.perform
And it works:
https://gist.github.com/galori/47db94ecb822de2ac17c
Related
Now I have a ruby like this:
def fizzbuzz(numSize)
result = []
1.upto(numSize) do |num|
if num % 15 == 0
result << "FizzBuzz"
elsif num % 3 == 0
result << "Fizz"
elsif num % 5 == 0
result << "Buzz"
else
result << num.to_s
end
end
result
end
print fizzbuzz(10) {|item| "-#{i1tem}-"}
If I want to print the result like this:
["-1-", "-2-", "-Fizz-", "-4-", "-Buzz-", "-Fizz-", "-7-", "-8-", "-Fizz-", "-Buzz-"]
What can I modify my code in method fizzbuzz if I can not change the code:
print fizzbuzz(10) {|item| "-#{i1tem}-"}
Thanks
That block is being given to your method, but you're not making use of it. That's an easy fix:
def fizzbuzz(numSize, &block)
# ... (existing code) ...
result.map(&block)
end
Where that transforms the result value using map.
Note this requires fixing the typo in your print block which is i1tem not item.
It's also worth noting you should avoid this pattern:
x = [ ]
y.each do |v|
x << f(v)
end
x
That's just a long-winded version of this:
y.map do |v|
f(v)
end
Where when you're transforming on a 1:1 basis from the source just use map.
In your case that reduces the code to this more minimal form that has a lot less repetition:
def fizzbuzz(numSize, &block)
1.upto(numSize).map do |num|
if num % 15 == 0
"FizzBuzz"
elsif num % 3 == 0
"Fizz"
elsif num % 5 == 0
"Buzz"
else
num.to_s
end
end.map(&block)
end
I have written the logic for the program to perform FizzBuzz operations:
fizzbuzz
module FizzBuzz
class Operation
def input
puts 'Enter a number upto which Fizz/Buzz needs to be printed'
num = gets.chomp.to_i
fizzbuzz_function(num)
end
def fizzbuzz_function(num)
for i in 1..num
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
end
end
res = Operation.new
res.input
end
But I am trying to print the output in form of a table.
Here is FizzBuzz in form of a table:
def fizzbuzz_gen(num)
Enumerator.new do |y|
(1..num).each do |i|
if i % 3 == 0 && i % 5 == 0
y << 'FizzBuzz'
elsif i % 3 == 0
y << 'Fizz'
elsif i % 5 == 0
y << 'Buzz'
else
y << i.to_s
end
end
end
end
def fill_to_width(width, e)
result = ""
future_length = -1
while result.length + future_length < width
result << e.next
result << " "
future_length = e.peek.length
end
result.center(width)
end
def format_table(num)
fb = fizzbuzz_gen(num)
begin
puts fill_to_width(75, fb)
puts fill_to_width(75, fb)
loop do
puts "%10s%s%31s%s" % ["", fill_to_width(12, fb), "", fill_to_width(12, fb)]
end
rescue StopIteration
end
end
format_table(100)
There may be less numbers output than specified, in order for one leg not to be shorter than another.
I know there has to be a better way to write this. I try not to use if/else if possible, or at least cut them down, but I'm still a noob with Ruby so some refactoring help would be much appreciated.
def super_fizzbuzz(array)
array.map {|x|
if x % 15 == 0
"FizzBuzz"
elsif x % 3 == 0
"Fizz"
elsif x % 5 == 0
"Buzz"
else x
end}
end
I would do it like this:
def super_fizzbuzz(array)
array.map do |x|
case
when x % 15 == 0 then 'FizzBuzz'
when x % 3 == 0 then 'Fizz'
when x % 5 == 0 then 'Buzz'
else x
end
end
end
[spoilers]
There are several ways to do this classic problem... This way has no ifs/elses
(1..100).each do |x|
m3 = x.modulo(3) == 0
m5 = x.modulo(5) == 0
puts case
when (m3 and m5) then 'FizzBuzz'
when m3 then 'Fizz'
when m5 then 'Buzz'
else x
end
end
OR, if you prefer the if statements and small code blocks, this is a good refactoring of what you have
(1..100).each{|i|
x = ''
x += 'Fizz' if i%3==0
x += 'Buzz' if i%5==0
puts(x.empty? ? i : x);
}
I will do something like
array.map do |x|
[FizzBuzz, Fizz, Default].map do |fizzer|
fizzer.new(x).get
end.compact.first
end
class FizzBuzz
attr_reader :x
private :x
def initialize(x)
#x = x
end
def get
'FizzBuzz' if x % 15
end
end
class Fizz
attr_reader :x
private :x
def initialize(x)
#x = x
end
def get
'FizzBuzz' if x % 3
end
end
Default = Struct(:get)
...
That way you will split responsabilities and have each class responsible for only one thing.
I'm having trouble getting an IF statement to produce the results I think they should. I'm not sure why I cannot get the && ("and") conditional to work.
def fizzbuzz(n)
pool = []
(1..n).each do |x|
if x % 3 == 0
pool.push('Fizz')
elsif x % 5 == 0
pool.push('Buzz')
elsif x % 3 == 0 && x % 5 == 0
pool.push('FizzBuzz')
else
pool.push(x)
end
end
puts pool
end
fizzbuzz(10)
and they results
1
2
Fizz
4
Buzz
Fizz
7
8
Fizz
Buzz
I'm not sure what I'm doing wrong here.
Try this instead:
def fizzbuzz(n)
pool = []
(1..n).each do |x|
if x % 3 == 0 && x % 5 == 0
pool.push('FizzBuzz')
elsif x % 5 == 0
pool.push('Buzz')
elsif x % 3 == 0
pool.push('Fizz')
else
pool.push(x)
end
end
puts pool
end
When you use if/elsif/elsif/else, it will execute only one of this conditions at time. If x % 3 == 0, then that's it, ruby will no longer enter any of those conditions, that's why fizzbuzz will never be printed.
The if/else if/else branching only executes one of the code blocks. If a condition is true, then the following block is executed and the program will skip to the end of the if/else statements.
Here is another working version, which is a bit cleaner, but as Tiago Farias said, you wont get the 'fizzbuzz' message printed in a range from [1..10], because you don't have a value which will have the rest 0 for both % 3 and % 5, the closest will be 15.
def fizzbuzz(n)
#pool = []
(1..n).each do |x|
send_no x
end
puts #pool
end
def send_no x
return #pool << 'fizzbuzz' if x % 3 == 0 && x % 5 == 0
return #pool << 'fizz' if x % 3 == 0
return #pool << 'buzz' if x % 5 == 0
#pool << x
end
fizzbuzz(10)
I often find myself checking multiple conditions. How can I cut down on the number of lines used to achieve the same effect?
def super_fizzbuzz(array)
final = []
for num in array
if num % 15 == 0
final << 'FizzBuzz'
elsif num % 5 == 0
final << 'Buzz'
elsif num % 3 == 0
final << 'Fizz'
else
final << num
end
end
final
end
def super_fizzbuzz(array)
array.map do |num|
a = []
a << 'Fizz' if num % 3 == 0
a << 'Buzz' if num % 5 == 0
a.empty? ? num : a.join()
end
end
def super_fizzbuzz(array)
final = []
array.each do |num|
num % 15 == 0 ? final << 'FizzBuzz' : num % 5 == 0 ? final << 'Buzz' : num % 3 == 0 ? final << 'Fizz' : final << num
end
final
end
But your way is more readable.
def super_fizzbuzz(array)
array.map do |num|
case 0
when num % 15 then "FizzBuzz"
when num % 5 then "Buzz"
when num % 3 then "Fizz"
else num
end
end
end
This is slightly more complex, but reduces number of explicit coded conditionals to 2:
FIZZBUZZ = { 3 => 'Fizz', 5 => 'Buzz' }
def super_fizzbuzz(array)
array.map do |num|
fbs = FIZZBUZZ.select do |divisor,cat|
num % divisor == 0
end.values
fbs.empty? ? num : fbs.join
end
end
There is always the danger when coding for DRY that you take things too far. In this case, with only two overlapping categories, I think the above is a little unwieldy. However, add another category or two:
FIZZBUZZ = { 3 => 'Fizz', 5 => 'Buzz', 7 => 'Boom', 11 => 'Whizz' }
and it starts to look smarter.
Quote:
I think Fizz-Buzz is "hard" for some programmers because (#1) it doesn't fit into any of the patterns that were given to them in school assignments, and (#2) it isn't possible to directly and simply represent the necessary tests, without duplication, in just about any commonly-used modern programming language.
Source: c2.com Wiki
Another way:
def super_fizzbuzz(arr)
arr.map do |e|
s = ''
s << 'Fizz' if (e%3).zero?
s << 'Buzz' if (e%5).zero?
s = e if s.empty?
s
end
end
super_fizzbuzz [9, 25, 225, 31]
#=> ["Fizz", "Buzz", "FizzBuzz", 31]