code: function asyncCompact(arr) {
      return asyncArray(when(arr).chain(function (result) {
          return compact.call(array, normalizeResult(result));
      }));
  }
docs: Async version of {@link comb.array.compact}.
  
  ```
  function asyncArr(){
  var ret = new comb.Promise();
  process.nextTick(ret.callback.bind(ret, [1,null,2,null,3,null,4,null,5]);
  return ret.promise;
  }
  
  comb.async.array(asyncArr()).compact().then(function(compacted){
  console.log(compacted); //[1,2,3,4,5]
  })
  
  comb.async.compact(asyncArr()).then(function(compacted){
  console.log(compacted); //[1,2,3,4,5]
  })
  
  ```
  
  @static
  @memberof comb.async
  @name compact