String enum
- TypeScript course
- Beginner
- Lesson 21/89
- 4 min
Learn more readable values with string enums.
String enum
In a string enum, each member has a string value and you must assign a string to every member explicitly. At runtime, the member's value is readable text rather than a number.
enum Durum { Acik = "acik", Kapali = "kapali" }
console.log(Durum.Acik); // "acik"A string enum produces meaningful values in logs and data transfer.
Why use a string enum?
A string enum gives readable values at runtime. When you log a numeric enum you see a number, but with a string enum the member's meaning appears directly as text. This makes debugging and data sharing easier.
enum Rol { Admin = "admin", Uye = "uye" }
console.log(Rol.Admin); // "admin"Seeing meaningful text instead of numbers makes tracing and understanding easier.
Practice Define the role constant
Define a const named Rol mapping Admin to "admin" and Uye to "uye" (string enum behavior). Print the value of Rol.Admin with console.log.
Starter code
// Rol adında bir const tanımla
// Admin "admin" ve Uye "uye" ile eşle
// Rol.Admin değerini yazdırSample solution
const Rol = { Admin: "admin", Uye: "uye" };
console.log(Rol.Admin);Expected output
admin
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 Which is a valid string enum definition?
- enum Durum { "acik", "kapali" }
- enum Durum { Acik, Kapali }
- enum Durum { Acik = 1, Kapali = 2 }
- enum Durum { Acik = "acik", Kapali = "kapali" } Correct answer
Explanation: In a string enum, every member must be assigned a string; <code>Acik = "acik", Kapali = "kapali"</code> is the correct definition. The others are either numeric or invalid syntax.
2 Complete the string enum member
enum Renk { Kirmizi = "kirmizi", Mavi = ____ }enum Renk { Kirmizi = "kirmizi", Mavi = "mavi" }Explanation: The <code>Mavi</code> member must have the value <code>"mavi"</code>; <code>"yesil"</code> is the wrong color, <code>"kirmizi"</code> belongs to another member, and <code>"Mavi"</code> is wrong casing.
3 String enum concepts
| Term | Meaning |
|---|---|
enum Durum { A = "a" } |
String-valued member |
String enum |
Each member must be assigned a string |
Durum.Acik |
Returns a string at runtime |
Dize enum |
Produces a readable value |