Re:Embedded Swift on the Raspberry Pi Pico
by mraleph on Wednesday March 06, 2024 @02:54AM
(#39613427)
In Dart 3 instead of declaring the variable and then comparing you can simply write an if-case pattern:
if (value case final value?) {
// value is a fresh final variable
}The more you know, I had totally missed this.
Re:Embedded Swift on the Raspberry Pi Pico
by Someone on Wednesday March 06, 2024 @07:53AM
(#39615408)
So Dart is moving in the Swift direction, which has
if let value = value {
// a new binding named ‘value’ refers to value, unwrapped
}
if let value {
// a new binding named ‘value’ refers to value, unwrapped
}
if let baz = foo.bar(42) {
// a new binding named ‘baz’ refers to foo.bar(42), unwrapped
}
)
if (value == null) { // value is still nullable here }
instead you need to first capture the value
final value = this.value if (value == null) { // value is non-null }
Swift's guard and if let syntax seems way nicer here. In swift, it's also nice to destructure nested nullable values using if let.
if let value = object.object?.value { // value is non null }
In dart you'd need to first assign this into a local variable and then do the null check which is unnecessarily verbose.