implicit_this_proposal

Implicit this (self) proposal

To align with JS/C#, an implicit this parameter should be provided to function calls. Later we can expand on this and provide this also in scopes. Behaviour of implicit this should mimic JS where possible.

Account = {
  balance: 100,
  withdraw: (howMuch) => {
    this.balance -= howMuch
    return this.balance;
  }
} 

print(Account.withdraw(40)) // prints 60

Currently, we would need to either pass a reference to Account explicitely as a param or use Account::withdraw & declare function withdraw via : notation.

It is for a consideration whether to implement this via prepending this in existing BuildArgumentList or to use a different mechanism.

Regardless of that, explicit params called this should be illegal and we should throw at compiletime when we encounter such a param.

function myFn(this) { // <-- throws "a parameter at position X can't be named "this")

}