pcdavid

public class Optional<T> {
  private final boolean isSet;
  private final T value;

  public static <T> Optional<T> nothing() {
    return new Optional<T>(false, null);
  }

  public static <T> Optional<T> value(T value) {
    return new Optional<T>(true, value);

pcdavid

#include <string.h>
int main() { char *self = "\"#include <string.h>\nint main() { char *self=%s; char *format = strdup(self+1); format[strlen(format)-2] = 0; print(format, self);  return 0;}\""; char *format = strdup(self+1); format[strlen(format)-2] = 0; printf(format, self); return 0;}

pcdavid

#!/usr/bin/env ruby

# From "On the Criteria To Be Used in Decomposing Systems into
# Modules", David L. Parnas, in CACM 15.12, p. 1053-1058, 1972:
#
# "The KWIC index system accepts an ordered set of lines, each line is
# an ordered set of words, and each word is an ordered set of
# characters. Any line may be "circularly shifted" by repeatedly
# removing the first word and appending it at the end of the line. The
# KWIC index system outputs a listing of all circular shifts of all

pcdavid

#!/usr/bin/env ruby

########################################
# numerote.rb
# Author: Pierre-Charles David (pcdavid@gmail.com)
# Version: 0.1
# Depends on: nothing (except Ruby)
# License: General Public License (GPL, see http://www.gnu.org/gpl)

# A very simple Ruby script useful to rename a set of files

pcdavid

#!/usr/bin/env ruby
print ARGF.readlines.sort_by { rand }

pcdavid

#!/usr/bin/env ruby

class String
  def scrmable
    return self if not self =~ /\w/m
    first, *letters = self.split(//)
    last = letters.pop
    if last
      order = Hash.new
      letters.each do |l|

pcdavid

#!/usr/bin/env ruby

########################################
# texml.rb
# Author: Pierre-Charles David (pcdavid@gmail.com)
# Version: 0.4
# Depends on: xmlparser (available on RAA)
# License: General Public License (GPL, see http://www.gnu.org/gpl)

# Based of Douglas Lovell's paper:

pcdavid

/**
 * Illustrates a limitation of the Java type system when using arrays.
 * The code below compiles without warnings but fails at runtime.
 */
public class JavaArraysBreakTypeSafety {
    public static void main(String[] args) {
        Object[] t = new String[1];
        t[0] = new Integer(1);
    }
}

pcdavid

import java.io.FileReader;
import java.io.IOException;
import java.io.LineNumberReader;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * Simple example of how to access environment variables in pure Java on Linux in pre-1.5 Java.
 * Since Java 1.5, System.getenv() can do this in a more portable way.

pcdavid

class Module
  def deprecate(*methodNames)
    methodNames.each do |methodName|
      module_eval <<END
      alias_method :deprecated_#{methodName}, :#{methodName}
	def #{methodName}(*args, &block)
	  $stderr.puts "Warning: calling deprecated method #{self}.#{methodName}"
	  return deprecated_#{methodName}(*args, &block)
	end
END