• d-bugmail puremagic.com (46/52) Jun 01 2012 http://d.puremagic.com/issues/show_bug.cgi?id=8181

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8181

           Summary: String splitting with nonempty delim produces empty
                    result
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody puremagic.com
        ReportedBy: bearophile_hugs eml.cc



Splitting of an empty string according to another nonempty delim string
produces an empty array result:


import std.stdio, std.string;
void main() {
    writeln("".split("."));
}


Output:
[]


While in Python2 it produces a list (array) that contains an empty string:

 "".split()



[]
 "".split(".")



['']


In most cases such Python string methods are carefully designed.

That Python behavour is useful:

 file_name = "ball.jpg"
 file_name.split(".")[-1] == "jpg"



True
 file_name = ""
 file_name.split(".")[-1] == "jpg"



False


While in D:

import std.stdio, std.string;
void main() {
    auto file_name = "ball.jpg";
    writeln(file_name.split(".")[$-1] == "jpg"); // Output: true
    file_name = "";
    writeln(file_name.split(".")[$-1] == "jpg"); // range violation
}


Workaround:

import std.stdio, std.array;
void main() {
    auto file_name = "";
    writeln(!file_name.empty && file_name.split(".")[$-1] == "jpg");
}

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