Get indexes of character in array
I'd like to get a list of indexes into an array that matches a character. E.g.:
"a foo a bar a".indexes("a") == [0, 6, 12]
Anything like that in Phobos?
Re: Get indexes of character in array
> 3/28/12, Andrej Mitrovic wrote:
> I'd like to get a list of indexes into an array that matches a character.
> E.g.:
>
> "a foo a bar a".indexes("a") == [0, 6, 12]
Hah I even managed to screw up that "bar" has an 'a' there. Anywho
this works just fine:
size_t[] indexes(string input, dchar target)
{
size_t[] result;
foreach (index, dchar ch; input)
{
if (ch == target)
result ~= index;
}
return result;
}
The cool thing about the foreach loop is that 'index' will point to
the exact code point of the target (it won't just be incremented by +1
on each loop).
Re: Get indexes of character in array
On 3/28/12, Andrej Mitrovic wrote: > snip Also a better name might be 'indices'.
Re: Get indexes of character in array
On 28 March 2012 19:35, Andrej Mitrovic wrote:
> I'd like to get a list of indexes into an array that matches a character.
> E.g.:
>
> "a foo a bar a".indexes("a") == [0, 6, 12]
>
> Anything like that in Phobos?
std.regex might be able to produce something like it.
--
James Miller
Re: Get indexes of character in array
On 28.03.2012 10:42, Andrej Mitrovic wrote:
3/28/12, Andrej Mitrovic wrote:
I'd like to get a list of indexes into an array that matches a character.
E.g.:
"a foo a bar a".indexes("a") == [0, 6, 12]
Hah I even managed to screw up that "bar" has an 'a' there. Anywho
this works just fine:
size_t[] indexes(string input, dchar target)
{
size_t[] result;
foreach (index, dchar ch; input)
{
if (ch == target)
result ~= index;
}
return result;
}
The cool thing about the foreach loop is that 'index' will point to
the exact code point of the target (it won't just be incremented by +1
on each loop).
Piece of cake indeed.
Just use Appender + put for building arrays in future, it's becoming
military grade soon:
https://github.com/D-Programming-Language/phobos/pull/502
--
Dmitry Olshansky
