Initial data commit

Task/Longest-common-subsequence/JavaScript/longest-common-subsequence-2.js

@@ -0,0 +1,10 @@
+const longest = (xs, ys) => (xs.length > ys.length) ? xs : ys;
+
+const lcs = (xx, yy) => {
+  if (!xx.length || !yy.length) { return ''; }
+
+  const [x, ...xs] = xx;
+  const [y, ...ys] = yy;
+
+  return (x === y) ? (x + lcs(xs, ys)) : longest(lcs(xx, ys), lcs(xs, yy));
+};