D already has a function to calculate the Levenshtein distance[1]. I am trying to come up with a function to calculate the Hamming distance[2] between two strings, `a` and `b`. So far, this seems to work:

foreach (i, j; zip(a, b)) {
    if (i != j)

Is there a way to use any of the std.algorithm.iteration[3] algorithms such as `filter` or `map` to do this as well?

[1] https://dlang.org/phobos/std_algorithm_comparison.html#levenshteinDistance
[2] https://en.wikipedia.org/wiki/Hamming_distance
[3] https://dlang.org/phobos/std_algorithm_iteration.html

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