function baseMap(collection, iteratee) {
	      var index = -1,
	          result = isArrayLike(collection) ? Array(collection.length) : [];

	      baseEach(collection, function(value, key, collection) {
	        result[++index] = iteratee(value, key, collection);
	      });
	      return result;
	    }
The base implementation of `_.map` without support for callback shorthands
and `this` binding.

@private
@param {Array|Object|string} collection The collection to iterate over.
@param {Function} iteratee The function invoked per iteration.
@returns {Array} Returns the new mapped array.