JavaScript Delete an element in an array of objects by property

Question

I have an array of objects in the form of

[  
   {prop1: value1,
   banks:[{_id:value,property2:value2}]
}]

So what I want to do is delete an element in "banks" property by searching for the "_id" value and then remove the found element from the banks array

"_id" property has unique values so there are no multiple occurrences of any value

I am doing this like

$scope.account.banks.splice($scope.account.banks.indexOf(item),1);

is there any better way for doing this?

item is an object with the all the same properties as an object in banks array would have. But, I am not getting the right results that's why I posted on SO — Harshit Laddha
– Harshit Laddha, Commented Sep 25, 2015 at 13:18
Your 'accounts' array isn't a valid array. Is it actually an array of objects, each with prop1 and banks as members? — Deftwun
– Deftwun, Commented Sep 25, 2015 at 13:28
No, it is not. I am using this on client side so it is on angularjs and not in server side — Harshit Laddha
– Harshit Laddha, Commented Sep 25, 2015 at 14:11

Deftwun · Accepted Answer · 2015-09-25 13:43:34Z

1

You could use array.filter to remove the banks that match item. Its a little cleaner than manually looping though it's still a little verbose. I made a little test case to illustrate what I'm talking about.

var accounts = [{
   prop1: 'value1',
   banks:[{_id:0,property2:'sdfbra'},
          {_id:1,property2:'qwedfg'},
          {_id:2,property2:'gaasdf'},
          {_id:3,property2:'asdfaa'}]
}]

var item = {_id:1,property2:'qwedfg'};

accounts[0].banks = accounts[0].banks.filter(function(element){
  return element._id !== item._id;
});

console.log (accounts[0].banks);

answered Sep 25, 2015 at 13:43

Deftwun

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Touffy · Accepted Answer · 2015-09-25 13:34:51Z

1

A better way to do it would be, if possible, to turn the banks array into a Map so you don't need to loop over the array, which may not scale well:

var m = new Map()
for(var bank of account.banks)
  m.set(bank._id, bank)
account.banks = m

Then you can remove items by id directly:

account.banks.delete(id)

Or do it with a regular object even. That way it wouldn't break your Angular code:

var m = {}
for(var bank of account.banks)
  m[bank._id] = bank
account.banks = m

…

delete account.banks[id]

answered Sep 25, 2015 at 13:34

Touffy

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1 Comment

Deftwun Over a year ago

This is probably way more efficient. Especially if you're accessing banks by _id all the time.

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