Angular delete service?

Question

I have a service "MyService" that contains the following:

this.myobj = {'dog': 'bark', 'cat': 'meow'}

I inject this service into a directive. Within the directive link function I have a $scope.$destroy that does the following:

console.log(MyService.myobj);
delete MyService.myobj.dog;
console.log(MyService.myobj);

The console.log output looks like after the delete still shows up as:

{'dog': 'bark', 'cat': 'meow'}

Even though I called the delete on the 'dog' key. What is going on? Is there a more proper way to delete the key?

tpie · Accepted Answer · 2015-04-09 04:17:20Z

3

Add a method to the service that deletes it's properties:

var myObj = {
dog: 'bark',
cat: 'meow',
delKey: function (keyName) {
    delete this[keyName];
    }
}

Then call the method:

MyService.myobj.delKey('dog');

If you want to have a method assigned to that service which can operate on any object within that service:

myObj: {
            dog: 'bark',
            cat: 'meow'
        },
delKey: function (obj, key) {
            delete this[obj][key];
        }

you can check out this plnkr:

http://plnkr.co/edit/f0ousH69sAm3Kdr36kNJ

edited Apr 9, 2015 at 4:17

answered Apr 9, 2015 at 2:11

tpie

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2 Comments

tpie Over a year ago

Just by way of best practices, I believe this is more appropriate for angular. You want to maintain a pretty high level of abstraction. A service should operate on itself by it's own methods, which can then be called by anyone who needs them. Came across this on a similar post, if it might be useful: perfectionkills.com/understanding-delete

Rolando Over a year ago

The problem with this is I don't want delKey within myObj as myObj is a part of the service. Ideally if there was a MyService.delKeyFromMyObj('dog') that could do the same, that would be more desirable.

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