(other) ->
      _.indexOf(other, item) >= 0


# Zip together multiple lists into a single array -- elements that share
# an index go together.
_.zip = ->
  length = _.max _.pluck arguments, 'length'
  results = new Array length
  for i in [0...length]
    results[i] = _.pluck arguments, String i
  results


# If the browser doesn't supply us with **indexOf** (I'm looking at you, MSIE),
# we need this function. Return the position of the first occurrence of an
# item in an array, or -1 if the item is not in