Szathmáry László honlapja @ DEIK | DLang / Hamming distance

See also:

std.algorithm
std.range

(1) Hamming distance

import std.stdio;
import std.algorithm; // count()
import std.range; // zip()

int hamming_dist(const string s1, const string s2) pure
{
if (s1.length != s2.length) {
return -1;
}
// else
// return cast(int) zip(s1, s2).count!((a, b) => a != b); // error, unpacking doesn't work here
return cast(int) zip(s1, s2).count!(t => t[0] != t[1]);
}

void main()
{
const s1 = "toned";
const s2 = "roses";

const dist = hamming_dist(s1, s2);
writeln(dist); // 3
}