Ordering results in Firebase - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to order documents by the field 'score' in ascending order.

Firebase

db.collection('games').orderBy('[1]').get()

Drag options to blanks, or click blank then click option'

Aname

Bdate

Cscore

Dlevel

Attempts:

3 left

💡 Hint

Common Mistakes

Using a field name that does not exist in the documents.

Forgetting to call orderBy before get().

The orderBy method sorts documents by the specified field. Here, 'score' is the field to order by.

2fill in blank

medium

Complete the code to order documents by 'date' in descending order.

Firebase

db.collection('games').orderBy('date', '[1]').get()

Drag options to blanks, or click blank then click option'

Adesc

Bascending

Cdescending

Dasc

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'ascending' or 'descending' instead of 'asc' or 'desc'.

Omitting the direction argument defaults to ascending.

The second argument to orderBy specifies the direction. Use 'desc' for descending order.

3fill in blank

hard

Fix the error in the code to order by 'level' ascending.

Firebase

db.collection('games').orderBy([1]).get()

Drag options to blanks, or click blank then click option'

A'level', 'asc'

B'level', 'desc'

Clevel

D'level'

Attempts:

3 left

💡 Hint

Common Mistakes

Passing multiple arguments inside one parameter.

Not using quotes around the field name.

The orderBy method takes the field name as a string. To order ascending, just provide the field name.

4fill in blank

hard

Fill both blanks to order by 'score' descending and then by 'date' ascending.

Firebase

db.collection('games').orderBy('[1]', '[2]').orderBy('date', 'asc').get()

Drag options to blanks, or click blank then click option'

Ascore

Bdesc

Casc

Ddate

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the order of fields.

Using wrong direction strings.

The first orderBy orders by 'score' descending. The second orders by 'date' ascending.

5fill in blank

hard

Fill all three blanks to order by 'level' descending, then by 'score' ascending, and finally by 'date' ascending.

Firebase

db.collection('games').orderBy('[1]', '[2]').orderBy('[3]', 'asc').orderBy('date', 'asc').get()

Drag options to blanks, or click blank then click option'

Alevel

Bdesc

Cscore

Ddate

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up field names and directions.

Using wrong direction strings.

Not chaining orderBy calls correctly.

The first orderBy sorts by 'level' descending. The second orderBy sorts by 'score' ascending. The third orderBy sorts by 'date' ascending.