iterator to each element. Use JavaScript
# 1.6's version of **map**, if possible.
_.map = (obj, iterator, context) ->
  return obj.map(iterator, context) if nativeMap and obj.map is nativeMap
  results = []
  _.each obj, (value, index, list) ->
    results.push iterator.call context, value, index, list
  results


# **Reduce** builds up a single result from a list of values. Also known as
# **inject**, or **foldl**. Uses JavaScript 1.8's version of **reduce**, if possible.
_.reduce = (obj, iterator, memo, c