Re: foreach loop

[Namal via Digitalmars-d-learn]

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);

well I tried this that way, but my count stays 0, same as if I do 
it in an int function with a return though I clearly have some 
false elements in the arr.