Is doom scrolling rotting our brains?
theguardian.com7 ポイント投稿者 ceronman2 コメント
struct Constant { value: i32 }
struct BinaryPlus { lhs: i32, rhs: i32 }
trait Evaluate {
fn evaluate(&self) -> i32;
}
impl Evaluate for Constant {
fn evaluate(&self) -> i32 { self.value }
}
impl Evaluate for BinaryPlus {
fn evaluate(&self) -> i32 { self.lhs + self.rhs }
}
// Adding a new operation is easy. Let's add stringify:
trait Stringify {
fn stringify(&self) -> String;
}
impl Stringify for Constant {
fn stringify(&self) -> String { format!("{}", self.value) }
}
impl Stringify for BinaryPlus {
fn stringify(&self) -> String { format!("{} + {}", self.lhs, self.rhs) }
}
// How about adding new types? Suppose we want to add FunctionCall
struct FunctionCall { name: String, arguments: Vec<i32> }
impl Evaluate for FunctionCall {
fn evaluate(&self) -> i32 { todo!() }
}
impl Stringify for FunctionCall {
fn stringify(&self) -> String { todo!() }
}
2. Even with my Mastercard credit card, the process is still inconvenient. For small purchases, it's fine. But for larger ones, there is an annoying second factor authentication, I have to enter a special password, and the wait to receive an SMS.
3. Visa and Mastercard fees. Most of the time these are paid by the merchant. But sometimes the customer has to pay more if the payment method is credit card. Some places don't accept these at all.
In general iDEAL is simple, secure and convenient. Not only to pay online, but also for example for splitting a bill with friends. I'm very happy to see this being adopted more widely in Europe.