Another task

[Simen kjaeraas]

On Thu, 20 Jan 2011 02:40:29 +0100, bearophile <bearophileHUGS at lycos.com>  
wrote:

> Simen kjaeraas:
>
>> Why use map()? The correct solution for this looks like so:
>>
>>
>> import std.range;
>>
>> void main( ) {
>>      auto aa = [1:"a", 2:"b", 3:"c"];
>>      auto result = zip( aa.keys, aa.values );
>> }
>
> That result is not the requested one:
> [(10,"aa"), (30,"bb"), (50,"cc")]
> And that result is not generated by lazily as the task asks (keys and  
> values return true arrays).

Soz, I read a bit too fast. It /is/ lazy, though perhaps not the way
you meant. This returns the right thing, but does not *read* lazily
 from the AA, a task I am unsure how, if at all possible, one should
perform.


import std.algorithm;
import std.range;

void main( ) {
     auto aa = [1:"a", 2:"b", 3:"c"];
     auto result = map!"tuple(a[0]*10,a[1]~a[1])"( zip( aa.keys, aa.values  
) );
}

-- 
Simen