It feels like there is nothing difference between the first one and the second one. But the first one code snippet can solve the stale closure. So, why the second one can't? I really can't figure it out. Can anyone…
emphasized textHi I'm learning Javascripts closures and tjis code beahves funny to me: function Unique_id2() { let counter = 0; function f() { return counter++; }; return f(); } console.log("UID2"); let f = Unique_id2; console.log(typeof f); console.log(f()); console.log(f()); console.log(f()); console.log(f());…
I'm trying to implement a debounce function using closure with typescript React. The problem is that it seems it's made a new reference of the function every time when I try to pass an event argument. So I think it…
I am learning JavaScript. I was practicing applying closures but I got stuck and am not able to find the issue with my code. function change_greeting() { let on_or_off = 1; return function button() { if (on_or_off) { document.getElementById("demo") =…
I don't understand why my returned function didn't change the value of the variable from the outer function. Hi, I wrote js function: function num() { let number = 0; console.log(number) return function() { return number++ } } then run…
I'm following this tutorial to send data back using Closures. https://betterprogramming.pub/5-ways-to-pass-data-between-view-controllers-18acb467f5ec in this tutorial point no 4 that is "Closures". I have two VC's one for selecting pet (FormsVC) and one for displaying selected pet (ProfileVC). below is a code…
I tried writing unit test for requestAuthorization by generating a mock for HKHealthStore. But I got an error. Asynchronous wait failed: Exceeded timeout of 2 seconds, with unfulfilled expectations: "Successfully tested requestAuthorization by returning true.". func requestAuthorization(completion: @escaping(Bool?, HealthError?) ->…
func checkUsername(username: String) -> Bool { var avalible = true Database.database().reference().child("usernames").child(username).observeSingleEvent(of: .value, with: { snapshot in if snapshot.exists() { print("exists") avalible = false } }) return available } I'm trying to check if a username exists. I've already tried multiple…
I have a group of react-native components that have similar interfaces. The important method in the interface is the run method. Users can execute this run method by pressing an action button for each of the components or by pressing…
I've looked at some comments to questions on stackoverflow about using [weak self] and [unowned self]. I need to be sure I understand correctly. I am using the latest Xcode - Xcode 13.4, the latest macOS - macOS Monterey 12.4,…