Merge objects with combined keys

merge.js

// Each table is an array [] of objects.
// Object MUST have all keys.
// Objects with matching keys will be merged into one object.
function merge(table1, table2){
  keys = ['key', 'note'];
  var merged = table1;
  for(i in merged){
    var obj1 = merged[i];
    for(j in table2){
      var obj2 = table2[j];
      var match = true;
      for(k in keys){
        key = keys[k];
        match *= (obj1[key] == obj2[key])
      }
      if(match){
        for(key in obj2){
          if(keys.indexOf(key) == -1){
            obj1[key] = obj2[key];
          }
        }
        delete table2[j];
        merged[i] = obj1;
      }
    }
  }
  for(i in table2){
    merged.push(table2[i]);
  }
  return merged;
}

// Note: This is O(N^2) in the worst case, you probably shouldn't use this for very large arrays.
// A better approach would be to use the keys to generate a hash and mock a Map<hash, object> for merging,
// but when hashing keys is hard this will work via brute force.