?? in typescript code example

Example 1: typescript integer

// There is no int type, use number
const myInt: number = 17;
const myDecimal: number = 17.5;

Example 2: how to declare a boolean in typescript

let isDone: boolean = false;

Example 3: ?. in typescript

?. in typescript

Example 4: angular type of string

if(typeof myVariable === 'string'){
	//do
}