On Wednesday, 4 September 2024 at 08:58:34 UTC, Sergey wrote:
Something like:
```d
l2.byPair.filter!"a.value > 0".map!(a => a.key).writeln;
```
Thank you for your answers, my forum friends. For tuples that are
not fully integrated into the language yet, byPair() is a nice
possibility. Because you don't need to import std.typecons.
Moreover, instead of a complicated syntax, associative array
makes life easier. Here is an example:
```d
import std.range, std.algorithm,
std.stdio;
void main()
{
//import std.array : byPair;/*
import std.typecons : Tuple;
alias T = Tuple!(string, "key", int, "value");
auto list = [T("Mutfak", 41), T("WC", 0),
T("Salon", 42),
T("Atelye", 0)
];
list.map!"a.key".writeln;
// ["Mutfak", "WC", "Salon", "Atelye"] ✓
/*/
auto list = ["Mutfak": 41, "WC": 0,
"Salon": 42,
"Atelye": 0
];
list.byPair.map!"a.key".writeln;
// ["WC", "Mutfak", "Atelye", "Salon"] ❓
// but the order is uncertain!
//*/
}
```
SDB@79
