number type

Learn to define numbers with the number type.

What is the number type?

The number type holds both integers and decimals; TypeScript has no separate int or float type. The type annotation again uses a colon.

let yas: number = 25;
let fiyat: number = 19.99;
console.log(yas, fiyat);  // 25 19.99

Whether you write 5 or 5.5, both are accepted as number.

Arithmetic with number

You can perform addition (+), subtraction (-), multiplication (*) and division (/) on number values. The result is again of type number.

let a: number = 12;
let b: number = 4;
console.log(a + b);  // 16
console.log(a / b);  // 3

Exercise Declare two numbers and print them

Declare a number variable named yas with value 30. Declare a second number named boy with value 1.75. Print both with a single console.log.

Show example solution

let yas: number = 30;
let boy: number = 1.75;
console.log(yas, boy);

Test yourself

Which of the following assignments is valid?
- let fiyat: number = "19.99";
- let fiyat: int = 19.99;
- let fiyat: float = 19.99;
- let fiyat: number = 19.99;
Show answer

let fiyat: number = 19.99; — TypeScript uses the single number type for both integers and decimals; there is no int or float. A text value cannot be assigned to number.

Complete the type annotation

let sicaklik: ____ = 23.5;

Show answer

let sicaklik: number = 23.5;

number concepts

number

integer and decimal type
25

integer value
19.99

decimal value
: number

type name

Next lesson: boolean type

We Are Enhancing Your Experience

Cookie Preferences

Strictly Necessary Cookies

Analytical Cookies