gistfile1.js

// For all you Rubyists out there, jQuery has a couple "hidden" methods 
// for working with arrays that work and are named just like Ruby, "grep" and "map":

foo = [1, 2, 3, 4, 5]

/* 
Ruby way:
foo.grep do |value|
  value > 2 && value < 5
end
*/

// jQuery way:
$.grep(foo, function(value, index){
  return value > 2 && value < 5;
});
// -> [3, 4]

/*
Ruby way:
foo.map do |value|
  value * 2
end
*/

// jQuery way:
$.map(foo, function(value, index){
  return value * 2;
});
//  -> [2, 4, 6, 8, 10]


// This jQuery tip has been brought to you by Paul Bakaus in the POOL.