Best way to modify code without breaking stuff.

[Henrique Dante de Almeida]

On Jun 4, 4:44 am, Ivan Illarionov <ivan.illario... at gmail.com> wrote:
> On Wed, 04 Jun 2008 00:25:19 -0700, Jesse Aldridge wrote:
> > I've got a module that I use regularly.  I want to make some extensive
> > changes to this module but I want all of the programs that depend on the
> > module to keep working while I'm making my changes.  What's the best way
> > to accomplish this?
>
> Version control system.
>
> http://en.wikipedia.org/wiki/List_of_revision_control_software
>
> Make your module a versioned repository.
> Make your changes in different place, then commit them.
>
> I use SVN and mercurial.
>
> Ivan

 Also:

 http://en.wikipedia.org/wiki/Regression_test
 http://en.wikipedia.org/wiki/Design_by_contract
 http://en.wikipedia.org/wiki/Test-driven_development