Retrieve an array of items from the Firebase snapshot

Currently in the process of retrieving items from my Firebase database, I am utilizing a snapshot that is generated when the page loads. I have collected the values of each object in an array and I am now attempting to add an item from each object into a separate array using a for loop.

However, upon creation of the second array, I am encountering an issue where there are more items present than there are objects within the snapshot.

I am seeking guidance on how to address this issue. Any assistance would be greatly appreciated. Thank you.

Here is the code snippet:

var ref = firebase.database().ref().child('/scenes/' + projId).orderByChild('wordcount');
ref.once('value',function(snap) {
    snap.forEach(function(item) {
        var itemVal = item.val();
        keys.push(itemVal);
        for (i=0; i < keys.length; i++) {
            counts.push(keys[i].wordcount);
        }
    });
});

Answer №1

To optimize efficiency, consider moving the addition of keys outside the forEach loop. This way, you can avoid looping over all keys each time something is added:

var ref = firebase.database().ref().child('/scenes/' + projId).orderByChild('wordcount');
ref.once('value',function(snap) {
    snap.forEach(function(item) {
        var itemVal = item.val();
        keys.push(itemVal);
    });
    for (i=0; i < keys.length; i++) {
        counts.push(keys[i].wordcount);
    }   
});

Answer №2

If you prefer, you could utilize lodash _.toArray()

By using _.toArray(snapshot.val()), you can transform your data object into an array of objects.

Check out the documentation

Answer №3

@mike axle: I found that simply including return true within the forEach loop did the trick for me. Happy coding! :)

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