22-04-29 Basic Types

number

let decimal: number = 6;

let hex: number = 0xf00d;

let binary: number = 0b1010;

let octal: number = 0o744;

let notANumber: number = NaN;

let underscoreNum: number = 1_000_000;

string

let fullName: string = "Mark Lee";

let age: number = 39;

let sentence: string = `Hello, My name is ${fullName}.

I'll be ${age + 1} years old next month.`;

console.log(sentence);

Array

let list: number[] = [1, 2, 3];
let list: (number | string)[] = [1, 2, 3, "4"];
let list: Array<number> = [1, 2, 3];

Tuple

let x : [string, number];
x = ["hello", 39];