Sandbox

 require 'wordlist'

 # Get evil idea and swap in code words
 print "Enter your new idea: " 
 idea = gets
 code_words.each do |real, code| 
   idea.gsub!( real, code )
 end

 # Save the jibberish to a new file
 print "File encoded.  Please enter a name for this idea: " 
 idea_name = gets.strip
 File::open( "idea-" + idea_name + ".txt", "w" ) do |f|
   f << idea
 end

Fifth slide: No, Learn You a Haskell

import System.IO
main = do
    handle <- openFile "girlfriend.txt" ReadMode
    contents <- hGetContents handle
    putStr contents
    hClose handle

Running it, we get the expected result:

$ runhaskell girlfriend.hs  
Hey! Hey! You! You!  
I don't like your girlfriend!  
No way! No way!  
I think you need a new one!

Seventh Slide … for Great Good

-- Let's use a fold to implement searching a list for a sublist.              
search :: (Eq a) => [a] -> [a] -> Bool  
search needle haystack = foldl length_test False (tails haystack)
  where length_test bool x = 
          if take needle_length x == needle then True else bool
        needle_length = length needle 

declaration :: String
declaration = "We hold these truths to be self-evident, " ++
              "that all men are created equal"

Here we get the result:

ghci> search "elf" declaration
True
ghci> search "eat" declaration
True

Eighth Slide: some math?

With some inline: $a = \frac{1}{π}$ , and some displayed:

$s = \sqrt{\frac{a}{t^{e^{π}}}}$

$\int_{0}^{1} f (x) d x$

Doesn’t work yet in the S5 slide show, only plain webpages — need to add a link to jsMath!

Ninth slide: C!

#include <stdio.h>
int main(void)
{
    printf("Hello World!");
    return 0;
}

Credits

Thanks for random snippets to

Why’s (poignant) guide to ruby

and

Learn You a Haskell for Great Good!

Here is a footnote reference,¹ and another.²

This paragraph won’t be part of the note, because it isn’t indented.

test

Here is the footnote. ↩
Here’s one with multiple blocks.

Subsequent paragraphs are indented to show that they belong to the previous footnote.
```
{ some.code }
```
The whole paragraph can be indented, or just the first line. In this way, multi-paragraph footnotes work like multi-paragraph list items. ↩