PatternMatching.ts

enum Drink { Beer, Koolaid }
enum PersonKind { AdultKind, ChildKind }

type Adult = {

    kind : PersonKind.AdultKind

    drink : Drink.Beer

    profession : string
}

type Child = {

    kind : PersonKind.ChildKind

    drink : Drink.Koolaid

    grade : string
}

type Person = Adult | Child


function describe(p: Person): string {

    switch(p.kind){
        case PersonKind.AdultKind : return p.profession
        case PersonKind.ChildKind : return p.grade
    }
}

const me: Adult = {
    kind : PersonKind.AdultKind,
    drink : Drink.Beer,
    profession: "software developer"
}


alert(describe(me));