Arrays

In JavaScript array can contain any type of data or mix of data types

Array Type Annotations

The TypeScript type annotation for array types is fairly straightforward: we put [] after the element type. In this code, names is an Array that can only contain strings:

let names: string[] = ['Danny', 'Samntha'];
// or you can declare as the following
let names: Array<string> = ['Danny','Samantha'];

if you try to assign number to names array, you will get a type error

let names: string[] = [1,2,3] // Type Error!

names.push(562) // Type Error!

Multi-dimensional Arrays

You can declare multi demensional arrays as:

let myArray: string[][]