reading file byLine

[Jordan Wilson via Digitalmars-d-learn]

On Thursday, 3 September 2015 at 22:21:57 UTC, Namal wrote:
>>
>> ep18.d(10): Error: no property 'split' for type 'char[]'
>> /usr/include/dmd/phobos/std/algorithm.d(427):        
>> instantiated from here: MapResult!(__lambda1, ByLine!(char, 
>> char))
>> ep18.d(10):        instantiated from here: map!(ByLine!(char, 
>> char))
>>
>> and then a long list to the end of my code
>>  Error: undefined identifier a
>
> Hmm, seems I forgot to add std.string, now it works, but words 
> seems not to be an array, at least I cannot access it like an 
> array. words[0][0] leads to
>
>  Error: no [] operator overload for type MapResult!(__lambda1, 
> ByLine!(char, char))
>
> So is is a map? How can I convert all the elements in it to 
> integer and store it in a real array?

I believe it's by using array:
auto words = file.byLine()           // you've all lines in  range
                   .map!(a => a.split).array();