On Saturday, 6 May 2017 at 10:15:03 UTC, k-five wrote:
On Saturday, 6 May 2017 at 08:53:12 UTC, Jonathan M Davis wrote:
On Saturday, May 6, 2017 8:34:11 AM CEST k-five via
Digitalmars-d-learn wrote:
On Friday, 5 May 2017 at 17:07:25 UTC, Stanislav Blinov wrote:
> On Friday, 5 May 2017 at 09:54:03 UTC, k-five wrote:
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Although I am not sure but it may Range in D, has the same
concept that C++ has on iterator, like InputIterator or
OutputIterator, since I realized that the output of [ filter ]
does not have RandomAccessRange so I can not use input[ 0 ].
But I can use input.front().
Also thank you @Stanislav Blinov, I am familiar with lambda but
have never seen a lambda in shape of string :)
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Solving the problem by using
split and empty in std.string
or splitter in std.algorithm or splitter in std.regex
plus
filter in std.algorithm,
and accessing the elements by:
input.front()
input.popFront()
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for input:
import std.stdio : print = writeln;
import std.algorithm: filter;
import std.string: split, empty;
void main() {
immutable (char)[] str = "one//two//three";
auto input = str.split( '/' ).filter!( element =>
!element.empty
)();
print( input.front );
input.popFront();
print( input.front );
input.popFront();
print( input.front );
}
the output is:
one
two
three
str.split('/') is eager, that is, it will iterate the input and
return the array of delimited elements. So in fact you're getting
an array of all elements (even empty ones), and then filtering
it, ignoring empty elements.
If you want to get the output as an array, it's better to use
std.array as Jonathan mentioned:
import std.array : array;
auto inputArray = str.splitter('/').filter!(a =>
!a.empty)().array;
This will eagerly consume the results of filter and put them into
an array.
