foreach loop
Namal via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Tue Nov 3 07:17:18 PST 2015
On Tuesday, 3 November 2015 at 15:10:43 UTC, wobbles wrote:
> On Tuesday, 3 November 2015 at 15:06:00 UTC, Namal wrote:
>> On Tuesday, 3 November 2015 at 14:52:19 UTC, Adam D. Ruppe
>> wrote:
>>> On Tuesday, 3 November 2015 at 14:47:14 UTC, Namal wrote:
>>>> I remember it is possible to get the index for each element
>>>> in the foreach loop, but I forgot how to do it. Can you help
>>>> me out please. Thx.
>>>
>>> for many of them it is as simple as:
>>>
>>> foreach(index, element; array) { }
>>
>> Thank you. I am still struggling with the functional ways of
>> D. Now how could I write this foreach loop the functional way?
>>
>> bool[] arr = [ture, false, ture, ...];
>>
>> int count;
>> foreach(i;arr){
>>
>> if(!i)
>> count++;
>> }
>> writeln(count);
>
> writefln("Count is: %s", arr
> .filter!(a => a==true)
> .sum);
>
> // Note: std.algorithm.sum is the same as
> // std.algorithm.reduce!((a,b)=a+b);
How do I save sum as integer or something I try;
arr.writeln;
return arr.filter!(a=>a==false).sum;
but I get
[true, false, true, false, true, true, true, false, true, false]
0
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