Type conversion expressions ($toInt, $toString) in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to convert the field 'age' to an integer using $toInt.

MongoDB

{ $project: { ageInt: { [1]: "$age" } } }

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

A$toString

B$toDate

C$toDouble

D$toInt

Attempts:

3 left

💡 Hint

Common Mistakes

Using $toString instead of $toInt.

Using $toDouble which converts to double, not integer.

The $toInt operator converts a value to an integer type.

2fill in blank

medium

Complete the code to convert the field 'score' to a string using $toString.

MongoDB

{ $project: { scoreStr: { [1]: "$score" } } }

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

A$toString

B$toInt

C$toBool

D$toDecimal

Attempts:

3 left

💡 Hint

Common Mistakes

Using $toInt which converts to integer, not string.

Using $toBool which converts to boolean, not string.

The $toString operator converts a value to a string type.

3fill in blank

hard

Fix the error in the code to convert 'price' to integer using $toInt.

MongoDB

{ $project: { priceInt: { [1]: "price" } } }

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

A$toString

B$toInt

C$toDouble

D$toDate

Attempts:

3 left

💡 Hint

Common Mistakes

Not prefixing the field name with '$'.

Using $toString instead of $toInt.

The field name must be prefixed with '$' to refer to the field value. The operator $toInt is correct for integer conversion.

4fill in blank

hard

Fill both blanks to convert 'quantity' to integer and 'description' to string.

MongoDB

{ $project: { qtyInt: { [1]: "$quantity" }, descStr: { [2]: "$description" } } }

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

A$toInt

B$toString

C$toDouble

D$toBool

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the operators for the fields.

Using $toDouble or $toBool incorrectly.

$toInt converts 'quantity' to integer, and $toString converts 'description' to string.

5fill in blank

hard

Fill all three blanks to convert 'height' to integer, 'weight' to string, and 'active' to boolean.

MongoDB

{ $project: { heightInt: { [1]: "$height" }, weightStr: { [2]: "$weight" }, isActive: { [3]: "$active" } } }

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

A$toInt

B$toString

C$toBool

D$toDouble

Attempts:

3 left

💡 Hint

Common Mistakes

Using $toDouble instead of $toBool for boolean conversion.

Mixing up $toInt and $toString.

$toInt converts 'height' to integer, $toString converts 'weight' to string, and $toBool converts 'active' to boolean.