Ary Borenszweig wrote:
Justin wrote:
I recently discovered D's function literals and wrote a small test to
explore them. The following code prints out a 15, then a 0. It seems
to me that the second should be 64 and not 0. Can anyone explain what
I'm doing wrong?
module functionliteral;
import std.stdio;
static void main() {
int[] values = [1,2,4,8];
writefln(Reduce(values, function int(int x, int y) { return x + y;
}));
writefln(Reduce(values, function int(int x, int y) { return x * y;
}));
}
static int Reduce(int[] values, int function(int x, int y) operation) {
int total;
That is:
total = 0
That's why in the second case it's like you are doing:
0*1*2*3*4
Well... 0*1*2*4*8
A reduce function normally takes the first value to use to reduce the
others. So "total" would be an argument to your reduce function.
foreach (int v; values)
total = operation(total,v);
return total;
}
