string type

Learn to define text with the string type.

What is the string type?

The string type holds text data: a single letter, word, sentence or long paragraph. To mark a variable as string, you write a colon and the type name after the variable name; this is called a type annotation.

let isim: string = "Ayşe";
let sehir: string = "İstanbul";
console.log(isim);  // Ayşe

The value inside quotes is text, the : string outside tells the compiler the type.

String concatenation

You can join two strings with the plus (+) sign. The result is again a string. This is the simplest way to combine several pieces into one text.

let on: string = "Kara";
let son: string = "deniz";
let tam: string = on + son;
console.log(tam);  // Karadeniz

Exercise Your first string variable

Declare a string variable named mesaj and assign "Merhaba dünya". Then print its value with console.log.

Show example solution

let mesaj: string = "Merhaba dünya";
console.log(mesaj);

Test yourself

In the line let mesaj: string = "merhaba";, which part is the type annotation?
- let
- mesaj
- : string
- "merhaba"
Show answer

: string — The colon and the type name after it (string) together form the type annotation.

Complete the type annotation

let renk: ____ = "mavi";

Show answer

let renk: string = "mavi";

Parts of a string declaration

let isim

variable declaration
: string

type annotation
"Ayşe"

text value
console.log

output function

Next lesson: number type

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