aarti

irb(main):040:0> testcases
=> ["hello world", "'hello world", "'hello' world", "hello' world"]
irb(main):041:0> testcases.each { |i| puts /(?<!')hello(?!')/.match(i) }
hello



=> ["hello world", "'hello world", "'hello' world", "hello' world"]

aarti

audience_range_values = []
age_from = nil
audience_range_values << age_from || 3 # does not work, returns book.a

print audience_range_values

audience_range_values = []

# output [nil]

aarti

Many concepts here to revisit, so saving in gist.
http://stackoverflow.com/questions/21712814/how-can-i-extract-the-bigger-value-for-each-key-in-a-list-of-hashes-in-ruby/21729254?noredirect=1#comment32860522_21729254

a = [{1=>19.4}, {1=>12.4}, {2=>29.4}, {3=>12.4}, {2=>39.4}, {2=>59.4}]

# the below is the main trick, to group the hashes and sorted the key/value pair
# in **ascending order**.
a.sort_by(&:to_a)
# => [{1=>12.4}, {1=>19.4}, {2=>29.4}, {2=>39.4}, {2=>59.4}, {3=>12.4}]

aarti

irb(main):001:0> 'A' * 3
=> "AAA"

aarti

# I thought this was neat
# Reference: http://stackoverflow.com/questions/21404323/combining-two-different-ranges-to-one-in-ruby

[*'0'..'9', *'a'..'z', *'A'..'Z'].shuffle.first(2).join

aarti

function genericallyCallingMap(dna) {
  var complements = {"C":"G", "G":"C", "T":"A", "A":"U"};  
  var map = Array.prototype.map
  var a = map.call(dna, function(x) {
     return complements[x];
   })
  return a.join("");
};
function callingMapOnAnArray(dna) {
  var a = dna.split("").map( function(x) {

aarti

class Bst
  
  attr_accessor :data, :left, :right
  
  def initialize(data)
    self.data = data
  end
  
  def insert_r(data)
    if (self.right ) 

aarti

class Element
  
  attr_accessor :datum, :next
  
  def initialize(datum,next_element)
    @datum = datum
    @next = next_element
  end
  
  def reverse

aarti

new_size(st_index_t size)
{
    st_index_t i;
    for (i=3; i<31; i++) {
	    if ((st_index_t)(1<<i) > size) return 1<<i;
    }
    #ifndef NOT_RUBY
      rb_raise(rb_eRuntimeError, "st_table too big");
    #endif
    return -1;			/* should raise exception */

aarti

--http://forums.coronalabs.com/topic/37362-improvement-to-the-ultimate-configlua-file/
--The effect of that bit of math is to set the content width or height appropriately for letterbox scaling according to the aspect ratio of the device.  Why is that good?  Because the upper-left corner is now (0,0), and display.contentWidth and display.contentHeight now cover the entire screen.  For example, on an iPhone 5, display.pixelHeight is 1136 and display.pixelHeight is 640.  If you do the math, you'll see that it'll set width to 320 and height to 568. 
-- It'll set the width and height appropriately for every single device, no matter what the resolution or aspect ratio.  And there's no need to code into your config.lua different blocks for different devices.
--the upper-left corner isn't at (0,0).  Instead, it's at (display.screenOriginX, display.screenOriginY)

local aspectRatio = display.pixelHeight/display.pixelWidth
 
application = 
{
    content =