Converting Firebase $asArray() to Javascript Array

Question

Is there any elegant way to go from Firebase $asArray() to a regular Javascript Array? I'm looking to get the difference between the array returned from Firebase and a regular array of objects.

var purchased = $firebase(new Firebase(FIREBASE_URL + 'purchased/' + uid)).$asArray();
  purchased.$loaded(function () {
    $scope.shopping_items = $(items).not(purchased).get();
  }

The goal of the above piece of code is to get the list of items that hasn't been purchased, the list of items is just a javascript array. If I can get the purchased array to be in the same format, the code should work.

possible duplicate of An efficient way to get the difference between two arrays of objects? — Frank van Puffelen
– Frank van Puffelen, Commented Oct 19, 2014 at 11:53

Community · Accepted Answer · 2017-05-23 12:25:48Z

3

First thing to understand about comparing objects is that two objects with identical keys and values are not equal because they are not the same object.

var x = {foo: 'bar'};
var y = {foo: 'bar'};
console.log(x === y); // false

Keep this in mind when you are trying to compare two arrays of objects.

With that said, a Firebase array is just like a regular Javascript array except for some utility methods like $add, $remove, $save.

If you wanted to get create a copy of the firebase array without the utility methods, you could use something like the following.

var regularArray = [];
for (var i = 0; i < firebaseArray.length; i++) {
  regularArray.push(firebaseArray[i]);
}

However, this doesn't doesn't really get you much closer to computing the difference of two arrays. The following might help though.

An efficient way to get the difference between two arrays of objects?

edited May 23, 2017 at 12:25

CommunityBot

11 silver badge

answered Oct 19, 2014 at 2:37

Nikita Kuznetsov

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2 Comments

Maher Manoubi Over a year ago

The link to the other question was very helpful and helped me solve the problem. Thank you.

Nikita Kuznetsov Over a year ago

Thanks for accepting the answer. Any chance I could get an upvote too? It would push me over the 50 point threshold. =)

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