Smart casting operator "is" and "!is" in kotlin
fun main(args: Array<String>) {
/* Smart Cast
for nullable types
is - !is - operator
*/
val obj: Any = 10
if(obj !is Long)
{
println("Obj is not string")
}
else
{
println("Obj is Long ${obj}")
}
}
SwiftUI - Tutorial 2 - 🧵 Understanding @MainActor in SwiftUI — A Beginner’s Guide
🧵 Understanding @MainActor in SwiftUI — A Beginner’s Guide When you start building iOS apps with SwiftUI , sooner or later you’ll run into this warning: ⚠️ “Publishing changes from background threads is not allowed; make sure to publish values from the main thread (via operators like receive(on:)) on model updates.” Sounds scary? Don’t worry 🙂 This is exactly where @MainActor comes to the rescue. 🔹 What is @MainActor ? In Swift, an actor is like a traffic controller that makes sure only one thing accesses a resource at a time. The @MainActor is a special actor provided by Swift that guarantees the code it marks will always run on the main thread . And that’s important because in iOS development: UI updates must always happen on the main thread. 🔹 Why do we need @MainActor in SwiftUI? SwiftUI automatically refreshes the UI when your @Published properties change. But if those changes happen on a background thread (for example, after fetching data from ...
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