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    <p>Commons-lang has a pretty fast implementation. See <a href="http://web.archive.org/web/20120526085419/http://www.merriampark.com/ldjava.htm" rel="nofollow noreferrer">http://web.archive.org/web/20120526085419/http://www.merriampark.com/ldjava.htm</a>.</p> <p>Here's my translation of that into Scala:</p> <pre class="lang-scala prettyprint-override"><code>// The code below is based on code from the Apache Commons lang project. /* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with this * work for additional information regarding copyright ownership. The ASF * licenses this file to You under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. */ /** * assert(levenshtein("algorithm", "altruistic")==6) * assert(levenshtein("1638452297", "444488444")==9) * assert(levenshtein("", "") == 0) * assert(levenshtein("", "a") == 1) * assert(levenshtein("aaapppp", "") == 7) * assert(levenshtein("frog", "fog") == 1) * assert(levenshtein("fly", "ant") == 3) * assert(levenshtein("elephant", "hippo") == 7) * assert(levenshtein("hippo", "elephant") == 7) * assert(levenshtein("hippo", "zzzzzzzz") == 8) * assert(levenshtein("hello", "hallo") == 1) * */ def levenshtein(s: CharSequence, t: CharSequence, max: Int = Int.MaxValue) = { import scala.annotation.tailrec def impl(s: CharSequence, t: CharSequence, n: Int, m: Int) = { // Inside impl n &lt;= m! val p = new Array[Int](n + 1) // 'previous' cost array, horizontally val d = new Array[Int](n + 1) // cost array, horizontally @tailrec def fillP(i: Int) { p(i) = i if (i &lt; n) fillP(i + 1) } fillP(0) @tailrec def eachJ(j: Int, t_j: Char, d: Array[Int], p: Array[Int]): Int = { d(0) = j @tailrec def eachI(i: Int) { val a = d(i - 1) + 1 val b = p(i) + 1 d(i) = if (a &lt; b) a else { val c = if (s.charAt(i - 1) == t_j) p(i - 1) else p(i - 1) + 1 if (b &lt; c) b else c } if (i &lt; n) eachI(i + 1) } eachI(1) if (j &lt; m) eachJ(j + 1, t.charAt(j), p, d) else d(n) } eachJ(1, t.charAt(0), d, p) } val n = s.length val m = t.length if (n == 0) m else if (m == 0) n else { if (n &gt; m) impl(t, s, m, n) else impl(s, t, n, m) } </code></pre> <p>}</p>
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