Re: Using lazy code to process large files

[kdevel via Digitalmars-d-learn]

On Wednesday, 2 August 2017 at 11:44:30 UTC, Martin Drašar wrote:

Thank you for any hint.

      1 import std.stdio;
      2 import std.string;
      3 import std.algorithm;
      4 import std.conv;
      5
      6 void main ()
      7 {
      8    auto input  = File("input.csv");
      9
     10    auto result = input.byLine()
     11       .filter!(a => a.startsWith("..."))
     12       .map!(a => a.splitter(",")
     13          .map!(b => b.stripLeft)
     14          .join(","))
     15       .join("\n");
     16
     17    auto output = File("output.csv", "w");
     18    output.write(result);
     19 }