New to D

[Era Scarecrow via Digitalmars-d-learn]

On Thursday, 27 October 2016 at 13:43:26 UTC, Steven 
Schveighoffer wrote:
> It depends on the size of the file and the expectation of 
> duplicate words. I'm assuming the number of words is limited, 
> so you are going to allocate far less data by duping on demand. 
> In addition, you may incur penalties for accessing the string 
> directly from the file -- the OS may have swapped out that page 
> and have to re-read it from the file itself.
>
> You could also read the entire file into a string and go based 
> on that.

  Depends. I recall experimenting early on with Memory mapped 
files (80Mb-300Mb), and it instantly loaded, no time at all. I 
don't think it even read the file or portions until I made 
requests to it (Course in my instance I'd have to create virtual 
records to access everything, still need to re-write and finish 
that project).

  It really depends on the circumstances though, and I suppose 
also understanding when a buffer is shared/reused and when to use 
dup.