how to use unique filter in angularjs

Question

$scope.students = [  
   { name: 'Hai', createdBy:'Thomas', createdOn:'09-09-2016' },  
   { name: 'Hal', createdBy:'Thomas', createdOn:'08-09-2016' }, 
   { name: 'Ho', createdBy:'Bob', createdOn:'07-09-2016', modifiedBy:'Alice', modifiedOn:'07-09-2016' },
   { name: 'Hoan', createdBy:'Thomas1', createdOn:'09-09-2016' }, 
   { name: 'Hieu', createdBy:'Bob', createdOn:'10-09-2016', modifiedBy:'Thomas1', modifiedOn:'07-09-2016' },
 ];

I dont want Bob beacuse Bob creation is modified by Alice in student name 'Ho' and Hieu is modified by 'Thomas1'

my expected final output is in unique name of last updatedby

Bob is not eligible for this list ok...

Last updatedBy Last updated date 

------------    --------------

Thomas      09-09-2016

Alice       07-09-2016

Thomas1     09-09-2016

@Sajeetharan yes Ji i am struggling in this field I need a log report for last modifeid if modifiedBy is undefined means look createdBy any possiblity for this scenarion for getting this result — Arav KT
– Arav KT, Commented Jan 30, 2017 at 13:10
@jitendravarshney whether Its not posibble ji. Thats why I am asking you understood my scenario? — Arav KT
– Arav KT, Commented Jan 30, 2017 at 13:27

Avnesh Shakya · Accepted Answer · 2017-01-30 14:13:14Z

1

Try this:

app.filter('test', function() {
  return function(items) {
    var filtered = [];

    angular.forEach(items, function(el) {
      if(el.modifiedBy && el.modifiedOn) {
        el.createdBy = el.modifiedBy;
        el.createdOn = el.modifiedOn;
      }
    });
    for(var i = 1; i < items.length; ){
      if(items[i-1].createdBy == items[i].createdBy){
        items.splice(i, 1);
      } else {
        i++;
      }
    }
    return items;
  }
});

JsFiddle link here

answered Jan 30, 2017 at 14:13

Avnesh Shakya

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Karthik VU · Accepted Answer · 2017-01-30 14:04:11Z

Rephrasing your problem statement into technical terms :

If a record is modified, then the modifier becomes the creator. How do I find the unique creators ?

One of the solution would be :

var students = [  
   { name: 'Hai', createdBy:'Thomas', createdOn:'09-09-2016' },  
   { name: 'Hal', createdBy:'Thomas', createdOn:'08-09-2016' }, 
   { name: 'Ho', createdBy:'Bob', createdOn:'07-09-2016', modifiedBy:'Alice', modifiedOn:'07-09-2016' },
   { name: 'Hoan', createdBy:'Thomas1', createdOn:'09-09-2016' }, 
   { name: 'Hieu', createdBy:'Bob', createdOn:'10-09-2016', modifiedBy:'Thomas1', modifiedOn:'07-09-2016' },
 ]; 

var studentsTemp = JSON.parse(JSON.stringify(students));  //deep copy

var unique = {};
 for(var i = 0; i < studentsTemp.length; i ++){
    if(studentsTemp[i].modifiedBy != null){
        studentsTemp[i].createdBy = studentsTemp[i].modifiedBy;
    }
    unique[studentsTemp[i].createdBy] = studentsTemp[i].createdOn;
 }

 console.log(unique);

Convert this code into an AngularJS filter.

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