Handy Util (Node.js) for when you expect an Array....and want to avoid "Object.forEach is not a function" errors.

forceArray.js

var forceArray = function(val) {
  if ( Array.isArray( val ) ) return val;
  if ( !val ) return [];
  return [ val ];
}

// usage:
var test1 = {id:1};
forceArray(test1) // returns [{id:1}] 

var test2 = "test";
forceArray(test2) // returns ["test"] 

var test3;
forceArray(test3) // returns []