Need help how to get started with D ranges

[John Colvin]

On Monday, 24 March 2014 at 12:13:43 UTC, Uranuz wrote:
> I see that ranges is primitive to organzie universal approach 
> to write some algorithms. But I'm using algorithms from the 
> library but I still can't start with writing my own algorithms 
> based on ranges. For example I have the following function 
> written without ranges. I want to improve it and make it 
> working with different types of strings (char[], string, 
> wchar[], etc...). So could someone give me an example how to 
> rewrite this function in `range`-style?
>
> //Parses HTML form data
> dstring[dstring] parseFormData2(dstring queryStr)
> {	size_t LexStart = 0;
> 	dstring curKey;
> 	dstring curValue;
> 	for( size_t i = 0; i < queryStr.length; ++i )
> 	{	if( queryStr[i] == '=' )
> 		{	curKey = queryStr[LexStart..i].idup;
> 			curValue = null;
> 			LexStart = i+1;
> 		}
> 		if( (queryStr[i] == '&') || (i+1 == queryStr.length) )
> 		{	curValue = queryStr[ LexStart .. (i+1 == queryStr.length) ? 
> ++i : i ].idup;
> 			if( curKey.length > 0)
> 			{	result[curKey] = curValue;
> 				//result[curKey] ~= curValue;
> 			}
> 			curKey = null;
> 			LexStart = i+1;
> 		}
> 	}
> 	return result;
> }

Have you read this: http://ddili.org/ders/d.en/ranges.html ?