javascript - $filter is not working -

i've created filter cell data of ui-grid. want apply custom filter built-in currency filter of angular. please find below code:

var helperservices = angular.module("helperservices",['constants']); helperservices.filter('getpriceformat',function(){     return function(val, $filter){                       if(val == 0)                 return;             else                 return ($filter('currency')(val, "", 7));                        } }); 

i getting error typeerror: undefined not function on return statement of else part.

how make built-in filter working inside custom filter ???

you're injecting $filter incorrectly, should be

helperservices.filter('getpriceformat',function($filter){     return function(val){                       if(val == 0)                 return;             else                 return ($filter('currency')(val, "", 7));                        } });