On Wed, Mar 21, 2012 at 17:21, Joe Gilray <jgil...@gmail.com> wrote: > Hi Tim, > > Thanks for sharing your code. > > Quick, newby question: why do you use "and" instead of "begin" in your > progress function? >
If you are used to run commands from bash you may do things like command1 && command2 && command3 e.g.: mkdir somedir && cd somedir && git clone ... Why people do that? Simply put, all of the commands after a `&&' are only run if the commands before executes fine (return code 0). So "git clone" will be executed only if I could create a dir and cd to it. It will not be executed if I don't have permissions to create a dir. Using "and" is like using "&&" in bash, while "begin" is equivalent of separating the commands with ";". More on short-circuit evaluation: http://en.wikipedia.org/wiki/Short-circuit_evaluation HTH, Rodolfo
____________________ Racket Users list: http://lists.racket-lang.org/users
