damerau levenshtein distance

Get Damerau-Levenshtein distance between strings.

const damerauLevenshteinDistance = require('@extra-string/damerau-levenshtein-distance');
// damerauLevenshteinDistance(<string-1>, <string-2>, [insertion cost=1], [deletion cost=1], [substitution cost=1], [transposition cost=1])

damerauLevenshteinDistance('gnu', 'gun');
// 1
damerauLevenshteinDistance('software', 'softwear');
// 2
damerauLevenshteinDistance('level field', 'lvele feidl', 1, 1, 1, 0.1);
// 0.4