how to declare array of arrays in typescript code example

Example 1: create array of... in typescript

let fruits: Array<string>;
fruits = ['Apple', 'Orange', 'Banana']; 

let ids: Array<number>;
ids = [23, 34, 100, 124, 44];

Example 2: array in typescript

const count = [...Array(5)];
count.map((_) => console.log('hi'));