Just some notes I took while going through the TypeScript documentation

DesctructingExamples.ts

//Destructuring Examples

//1.0 Array destructing

let travelClasses = [200, 500, 1000];

let [economy, business, first] = travelClasses;

console.log("Business class price:" + business); //500


//1.1 Swap

[first, business, economy] = [economy, business, first];

console.log("Someone got a cheap firstclass flight!\n" + first); //first = 200


//1.2 Function

function bookRoundTrip([dDate, rDate]: [Date, Date]) {
    console.log("Destination flight date: " + dDate);
    console.log("Return flight date: " + rDate);
}

let dDate = new Date();
let rDate = new Date();
dDate.setDate(dDate.getDate() + 1);
rDate.setMonth(rDate.getMonth() + 1);

bookRoundTrip([dDate, rDate]);



//2.0 Object Destructing

let flight = {
    No: "CR9023453",
    NumberOfSeats: 120,
    NumberOfSeatsOccupied: 107
};


let { NumberOfSeats, NumberOfSeatsOccupied } = flight;

//2.1 Renaming properties

let { No: FlightNo, NumberOfSeats: Seats, NumberOfSeatsOccupied: SeatsOccupied } = flight;

console.log(Seats);


//3.0 Default values for undefined properties on an object passed into a function

function printFlight(trip: { departure?: string, destination?: string}) {
    let { departure = "Hong Kong International Airport",
        destination = "Hartsfield–Jackson Atlanta International Airport" } = trip;

    console.log("Departure: " + departure + "\nDestination: " + destination);
}

printFlight({ departure: undefined, destination: undefined});