Why enums are needed in Typescript - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an enum named Direction.

Typescript

enum Direction {
  Up = [1],
  Down,
  Left,
  Right
}

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

A0

B1

Ctrue

D"UP"

Attempts:

3 left

💡 Hint

Common Mistakes

Using string values instead of numbers without explicit string enums.

Starting enum values at 1 without specifying.

Enums start numbering from 0 by default unless specified otherwise.

2fill in blank

medium

Complete the code to access the enum value for Direction.Left.

Typescript

const leftValue = Direction.[1];

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

ADown

BRight

CUp

DLeft

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase or misspelled enum member names.

Trying to access enum values by number directly.

You access enum members by their names, like Direction.Left.

3fill in blank

hard

Fix the error in the enum declaration by completing the missing part.

Typescript

enum Status {
  Active = [1],
  Inactive,
  Pending
}

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

A"active"

B1

Ctrue

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using string values without quotes.

Using boolean values in enums.

Enum numeric values must be numbers. Using 1 starts numbering from 1.

4fill in blank

hard

Fill both blanks to create a function that returns a string based on enum input.

Typescript

function getStatusMessage(status: Status): string {
  switch(status) {
    case Status.Active:
      return [1];
    case Status.Inactive:
      return [2];
    default:
      return "Unknown";
  }
}

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

A"User is active"

B"User is inactive"

C"Active"

D"Inactive"

Attempts:

3 left

💡 Hint

Common Mistakes

Returning enum names instead of messages.

Mixing up messages for statuses.

The function returns descriptive messages for each enum status.

5fill in blank

hard

Fill all three blanks to create a numeric enum and use it in a condition.

Typescript

enum Level {
  Low = [1],
  Medium,
  High
}

const currentLevel = Level.[2];

if (currentLevel > Level.[3]) {
  console.log("Level is above Low");
}

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

A0

BMedium

CLow

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using string values instead of numbers in numeric enums.

Comparing enum values incorrectly.

The enum starts at 0 for Low, Medium is next, and the condition checks if currentLevel is above Low.