fix(ngShow/ngHide, ngIf): functions with zero args should be truthy

Previously, expressions that were a function with one or more arguments evaluated to
true, but functions with zero arguments evaluated to false.

This behavior seems both unintentional and undesirable. This patch makes a function
truthy regardless of its number of arguments.

Closes #5414

1 files changed, 10 insertions, 0 deletions

diff --git a/test/ng/directive/ngShowHideSpec.js b/test/ng/directive/ngShowHideSpec.js
index 4a8e55da..30397c4c 100644
--- a/test/ng/directive/ngShowHideSpec.js
+++ b/test/ng/directive/ngShowHideSpec.js
@@ -20,6 +20,16 @@ describe('ngShow / ngHide', function() {
     }));
 
 
+    // https://github.com/angular/angular.js/issues/5414
+    it('should show if the expression is a function with a no arguments', inject(function($rootScope, $compile) {
+      element = jqLite('<div ng-show="exp"></div>');
+      element = $compile(element)($rootScope);
+      $rootScope.exp = function(){};
+      $rootScope.$digest();
+      expect(element).toBeShown();
+    }));
+
+
     it('should make hidden element visible', inject(function($rootScope, $compile) {
       element = jqLite('<div class="ng-hide" ng-show="exp"></div>');
       element = $compile(element)($rootScope);