Edit in JSFiddle

angular.module('customFilterApp',[])
.filter('getEven',function(){
	return function(numberArray){
		var size = numberArray.length;
		var evenNumbers = [];
		for(counter=0;counter<size;counter++)
		{
			if(numberArray[counter]%2==0) //Check for Even number and add to evenNumbers Array
				evenNumbers.push(numberArray[counter]);
		}
		return evenNumbers;
	}
})

<div data-ng-app="customFilterApp">
  <div>
      {{[2,3,5,6,7,8,9,1]|getEven}}
  </div>
</div>