Code Golf: Choose

Jan 16, 2008  -  Comments

Here is my submission for the Choose challenge. Code size: 88 bytes.

def g(r)(1..r).inject(1){|m,n|m*n}end
x,y=gets.split.map{|n|n.to_i}
p g(x)/(g(y)*g(x-y))

Tagged: rubycode golf

Code Golf: Numeric Diamonds

Dec 08, 2007  -  Comments

Here is my submission for the Numeric Diamonds challenge. Code size: 219 bytes.

[9,36,100].each{|n|s=Math.sqrt(n).to_i
w=n.to_s.size.to_i
a=[]
j=s+s-1
j.times{a<<[" "*w]*j}
x=0
y=s-1
f=x
g=y
1.upto(n){|t|a[x][y]=t.to_s.rjust w
t%s<1 ?(x=f+1;f=x;y=g-1;g=y):(x+=1;y+=1)}
a.each{|r|puts r.join.rstrip}}

Tagged: rubycode golf

Parsing an RSS feed with Ruby

Jun 09, 2007  -  Comments

Parsing an RSS feed is insanely simple with Ruby. Two lines is all it takes. . .

require 'rss'
rss = RSS::Parser.parse(open('http://www.travisonrails.com/feed/posts').read, false)

Now you'll have an Array of the results, so you can do something like:

rss.items.each { |i| puts "#{i.title} - #{i.date}" }

Tagged: tutorialrssruby

Generate random text with Ruby

Jun 07, 2007  -  Comments

UPDATE: Changed the generate_password method slightly based on commenter Dave Burt's suggestion.

I'm working on a project where the user can reset their password if they've forgotten it. So, I need to generate a random password and email it to them so they can login and change it. Fortunately, I found this neat little Ruby snippet that will generate random text of a given length:

def generate_password(length=6)
  chars = 'abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ23456789'
  password = ''
  length.times { |i| password << chars[rand(chars.length)] }
  password
end

Some examples:

generate_password
>> U48ydn

generate_password(10)
>> QzWXdAkDy5

Tagged: tutorialscriptruby

Code Golf: Roman to Decimal

Feb 07, 2007  -  Comments

Here is my submission for the Roman to Deciman challenge. Code size: 121 bytes.

v={'I',1,'V',5,'X',10,'L',50,'C',?d,'D',500,'M',1000}
y=q=0
gets.chop.split('').each{|n|j=v[n]
y+=j-(q<j ?q*2:0)
q=j}
p y

Tagged: rubycode golf