File: hamming.go

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golang-github-xrash-smetrics 0.0~git20170218.a3153f7-2
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package smetrics

import (
	"fmt"
)

func Hamming(a, b string) (int, error) {
	al := len(a)
	bl := len(b)

	if al != bl {
		return -1, fmt.Errorf("strings are not equal (len(a)=%d, len(b)=%d)", al, bl)
	}

	var difference = 0

	for i := range a {
		if a[i] != b[i] {
			difference = difference + 1
		}
	}

	return difference, nil
}