From the hub, tagged: "Idioms"

Prolog: Forwards and Backwards

A key idiom in Prolog is the idea that it runs both forwards and backwards. If you've never programmed in Prolog before, this can be mind-blowing! You can write one "function" and get many different uses out of it. In this post we'll take a look at what this means as a teaser that might tempt you into giving Prolog a go.