typescript

TypeScript Enums

Last Sync: Today

typescript

TypeScript Enums

What is an Enum?

Enums are a way to define a set of named constants in TypeScript, making code more readable and maintainable.

Numeric Enum

TypeScriptRead-only

enum Direction {
  Up,
  Down,
  Left,
  Right
}

enum Direction {
  Up,
  Down,
  Left,
  Right
}

Custom Values

TypeScriptRead-only

enum Status {
  Success = 200,
  NotFound = 404,
  Error = 500
}

enum Status {
  Success = 200,
  NotFound = 404,
  Error = 500
}

String Enum

TypeScriptRead-only

enum Role {
  Admin = 'ADMIN',
  User = 'USER'
}

enum Role {
  Admin = 'ADMIN',
  User = 'USER'
}

Using Enum

TypeScriptRead-only

let userRole: Role = Role.Admin;

let userRole: Role = Role.Admin;

Enum vs Object

Feature	Enum	Object
Type Safety	Yes	No
Readability	High	Medium
Usage	Constants	General data

Best Practices

Use enums for fixed values
Prefer string enums for readability
Use meaningful names
Avoid overusing enums

Common Mistakes

Using enums unnecessarily
Confusing numeric values
Not using descriptive names
Overcomplicating enums

Conclusion

Enums provide a structured way to define constants in TypeScript, improving readability and maintainability.

Try it yourself

enum Role { Admin, User }
let r = Role.Admin;

Test Your Knowledge

of 3

Enum used for?

Functions

Constants

Loops

API

of 3

String enum?

Yes

Only number

Only object

of 3

Enum improves?

Speed

Readability

Memory

API

Frequently Asked Questions

What is enum?

A set of named constants.

Types of enums?

Numeric and string enums.

Why use enums?

For readable constant values.

typescript

TypeScript Enums

Last Sync: Today

typescript

TypeScript Enums

What is an Enum?

Enums are a way to define a set of named constants in TypeScript, making code more readable and maintainable.

Numeric Enum

TypeScriptRead-only

enum Direction {
  Up,
  Down,
  Left,
  Right
}

enum Direction {
  Up,
  Down,
  Left,
  Right
}

Custom Values

TypeScriptRead-only

enum Status {
  Success = 200,
  NotFound = 404,
  Error = 500
}

enum Status {
  Success = 200,
  NotFound = 404,
  Error = 500
}

String Enum

TypeScriptRead-only

enum Role {
  Admin = 'ADMIN',
  User = 'USER'
}

enum Role {
  Admin = 'ADMIN',
  User = 'USER'
}

Using Enum

TypeScriptRead-only

let userRole: Role = Role.Admin;

let userRole: Role = Role.Admin;

Enum vs Object

Feature	Enum	Object
Type Safety	Yes	No
Readability	High	Medium
Usage	Constants	General data

Best Practices

Use enums for fixed values
Prefer string enums for readability
Use meaningful names
Avoid overusing enums

Common Mistakes

Using enums unnecessarily
Confusing numeric values
Not using descriptive names
Overcomplicating enums

Conclusion

Enums provide a structured way to define constants in TypeScript, improving readability and maintainability.

Try it yourself

enum Role { Admin, User }
let r = Role.Admin;

Test Your Knowledge

of 3

Enum used for?

Functions

Constants

Loops

API

of 3

String enum?

Yes

Only number

Only object

of 3

Enum improves?

Speed

Readability

Memory

API

Frequently Asked Questions

What is enum?

A set of named constants.

Types of enums?

Numeric and string enums.

Why use enums?

For readable constant values.

TypeScript Enums

TypeScript Enums

What is an Enum?

Numeric Enum

Custom Values

String Enum

Using Enum

Enum vs Object

Best Practices

Common Mistakes

Conclusion

Try it yourself

Test Your Knowledge

Frequently Asked Questions

Need help?

TypeScript Enums

TypeScript Enums

What is an Enum?

Numeric Enum

Custom Values

String Enum

Using Enum

Enum vs Object

Best Practices

Common Mistakes

Conclusion

Try it yourself

Test Your Knowledge

Frequently Asked Questions

Need help?