reading from file

[Ali Çehreli via Digitalmars-d-learn]

On 12/15/2016 10:47 PM, KaattuPoochi wrote:
 > On Tuesday, 13 December 2016 at 21:13:26 UTC, Ali wrote:
 >>
 >> And extending Ali's solution you can actually get the data in
 >> to a two dimentional array at compile time and have it in static
 >> memory with a small adjustment:
 >>
 >> static immutable matrix = import("data.txt")
 >>     .split("\n")
 >>     .map!(a => a.split(",").map!(to!int).array)
 >>     .array;
 >>
 >> void main() {
 >>     writeln(matrix);
 >> }
 >
 > 1. For any non-trivial matrices (with 500 lines) runs DMD 2.072.1 out of
 > memory (2GB). Not sure if this is a known bug. Works fine with LDC 1.0.0.

Compile time features are awesome but currenty very inefficient. :)

 > 2. The EOL on the last line results in an empty row in the end. Is there
 > a way to overcome this?

If appropriate, you can filter out all empty lines. Added .map!strip and 
.filter:

import std.stdio;
import std.algorithm;
import std.array;
import std.conv;
import std.string;

void main() {
     auto a = File("deneme.txt")
              .byLine
              .map!strip
              .filter!(line => !line.empty)
              .map!(line => line.splitter(',').map!(to!int).array)
              .array;

     writeln(a);
}

Ali