Summary - Enum

Write an order status tracker using enums.

Enum summary

An enum groups named constants under one name. A numeric enum auto-increments and supports reverse mapping. A string enum gives readable string values. A const enum inlines values at use sites at compile time. For structured data such as order status tracking, an enum provides both type safety and readability.

enum SiparisDurumu { Bekle = "bekle", Teslim = "teslim" }
let durum: SiparisDurumu = SiparisDurumu.Bekle;
console.log(durum);  // "bekle"

Choose numeric, string or const enum according to the need.

Exercise Order status tracking program

Define a const named SiparisDurumu mapping Bekle to "bekle" and Teslim to "teslim" (string enum behavior). Declare a variable named durum and set its value to SiparisDurumu.Teslim. Print the value of durum with console.log.

Show example solution

const SiparisDurumu = { Bekle: "bekle", Teslim: "teslim" };
let durum = SiparisDurumu.Teslim;
console.log(durum);

Test yourself

Which enum is suitable for showing readable values in logs?
- const enum Durum { Bekle, Hazir }
- enum Durum { Bekle = 0, Hazir = 1 }
- enum Durum { Bekle = "bekle", Hazir = "hazir" }
- enum Durum { Bekle, Hazir }
Show answer

enum Durum { Bekle = "bekle", Hazir = "hazir" } — A string enum shows meaningful text instead of numbers in logs; the numeric and const enum options produce only numbers.

Complete the order status enum

enum SiparisDurumu { Bekle = "bekle", Gonderildi = ____ }

Show answer

enum SiparisDurumu { Bekle = "bekle", Gonderildi = "gonderildi" }

Enum types summary

Numeric enum

Auto-incrementing number constants
String enum

Readable string constants
const enum

Inlined at compile time
Reverse mapping

Value-to-name lookup

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