Extra explanation for MATLAB users on using array-like objects

[ci skip]

doc/manual/noteworthy-differences.rst

@@ -46,7 +46,14 @@ some noteworthy differences that may trip up Julia users accustomed to MATLAB:
  the syntax ``[a b; c d]`` is used to avoid confusion. In Julia v0.4, the
  concatenation syntax ``[x, [y, z]]`` is deprecated in favor of ``[x; [y, z]]``.
 - In Julia, ``a:b`` and ``a:b:c`` construct :obj:`Range` objects. To construct
- a full vector like in MATLAB, use :func:`collect(a:b) <collect>`.
+ a full vector like in MATLAB, use :func:`collect(a:b) <collect>`. Generally,
+ there is no need to call ``collect`` though. ``Range`` will act like a normal
+ array in most cases but is more efficient because it lazily computes its
+ values. This pattern of creating specialized objects instead of full arrays
+ is used frequently, and is also seen in functions such as :func:`linspace
+ <linspace>`, or with iterators such as :func:`enumerate <enumerate>`, and
+ :func:`zip <zip>`. The special objects can mostly be used as if they were
+ normal arrays.
 - Functions in Julia return values from their last expression or the ``return``
  keyword instead of listing the names of variables to return in the function
  definition (see :ref:`man-return-keyword` for details).