JavaScript function for stitching two arrays with overlapping ends into a single array (e.g. [1,2,3] and [3,4,5] into [1,2,3,4,5]).

gistfile1.txt

function stitch(s1,s2) {
  var l1 = s1.length;
  var l2 = s2.length;
 
 
  if (!l1) return s2;
  if (!l2) return s1;
 
  if (s2[0] == s1[l1-1]) return s1.concat(s2.slice(1));        
  if (s1[0] == s2[l2-1]) return s2.concat(s1.slice(1));
 
  s2.reverse();       
 
  if (s2[0] == s1[l1-1]) return s1.concat(s2.slice(1));        
  if (s1[0] == s2[l2-1]) return s2.concat(s1.slice(1));
 
  return false;
 
}