When coming from another language it is good to find out where D stands in relation to it. There is the feature list which states if a feature exists or not and possibly an explanation. For a side-by-side comparison of many languages: Languages vs D or you can look at code snippets of from Rosetta Code.
A very superficial way to find out the popularity of D in relation to other languages can is at the Tiobe Index website.
For information about syntactical differences or gotchas when coming from another language choose your language below.
- Programming in D for C Programmers
- Programming in D for C++ Programmers
- Delphi or Pascal
If you are interested in converting your code to D start by looking at the Porting Overview.