Function when

test/angular/1.6/angular.js:17532–17536

* @ngdoc method * @name $q#when * @kind function * * @description * Wraps an object that might be a value or a (3rd party) then-able promise into a $q promise. * This is useful when you are dealing with an object that might or might not be a promise, or if * the promise comes fr

(value, callback, errback, progressBack)

  function when(value, callback, errback, progressBack) {
    var result = new Promise();
    resolvePromise(result, value);
    return result.then(callback, errback, progressBack);
  }

  /**
   * @ngdoc method