Notes

Some lesser known nice things about Japan 🗾

• Ambulances are loud, but not too loud.
• When Police cars do unexpected things like making a U-turn suddenly, they politely inform everyone nearby with a megaphone.
• When large vehicles make a turn near a pedestrian they play a vocal warning "Watch out! I'm about to turn left!"
• Dog owners carry a bottle of water to wash away any pee the dog might do on a walk.
• There are lots of outside gyms.
• There are lots of summer festivals which aren't exclusively an excuse to get drunk.
• Its not okay to be ugly.
  • You better look your best if you're thinking about leaving your home.
  • Foreigners usually get the benefit of the doubt.
• Lots of stuff made in Japan for Japanese people only. (Films, cars, appliances...)
• There is one and only one right way to do everything.
  • If you order something in a cafe or a restaurant, chances are they'll tell you the right way to consume it.
  • e.g. You order an iced coffee creamy thing from a local cafe.
    1. First taste the top and bottom layers independently before mixing them both together with the straw...
• There is a lot of wildlife everywhere.
  • Probably more wildlife in Tokyo than in any National park in the UK.
• There are dry ice machines in some supermarkets.
• Some cars have a horn? that says in a polite voice "Please watch out, a car is passing by!" to unsuspecting pedestrians that haven't noticed.
• Relaxing background music automatically starts playing the instant your skin comes into contact with the toilet seat.
• Safety first
  • At petrol stations there is an "anti static electricity pad" for you to touch before filling up your car.
• The sky is big.

Its been a while since I did any data modelling in typescript.

// An example of a user management system
// Define user status type, just an enum
type UserAccountStatus = "ACTIVE" | "DORMANT" | "DELETED"
// Define a base type
type BaseUser = { name: string; status: UserAccountStatus }
// Create concrete types using the base type
type ActiveUser = BaseUser & { status: "ACTIVE" }
type DormantUser = BaseUser & { status: "DORMANT" }
type DeletedUser = BaseUser & { status: "DELETED" }
type User = ActiveUser | DormantUser | DeletedUser
// Create the type of function we want to implement
// Make return type a promise because we talk to the DB
type DeleteUser = (user: ActiveUser | DormantUser) => Promise<DeletedUser>
// do a temporary implementation of the function
const deleteUser: DeleteUser = (user) => {
  const deletedUser: DeletedUser = { ...user, status: "DELETED" }
  // define a helper that we haven't got yet
  return writeUserToDB(deletedUser)
}
// declare the type of the helper like so:
declare function writeUserToDB<A extends User>(user: A): Promise<A>

Bought some books with the intention of learning Chinese but yeah its pretty hard.
As long as I don't give up completely I might be ok at it in the region of say... a decade?
Which is really not too long when you think about it.
So I guess nothing to complain.

https://www.youtube.com/watch?v=I9gLrRwLFCs

Tonight is city pop vibes 🗾

nice