Where can I get a list of Countries, States and Cities? [closed]
The UN maintains a list of countries and “states” / regions for economic trade. That DB is available here: http://www.unece.org/cefact/locode/welcome.html
state
pushState: what exactly is the state object for?
Take this small example – run fiddle: You have a page where a user can select a color. Every time they do, we generate a new history entry: function doPushState (color) { var state = {}, title = “Page title”, path = “/” + color; history.pushState(state, title, path); }; We leave the state object blank … Read more
Where Should Model State Be Stored In Angular.js
State (and models) are stored in $scope $scope is Angular’s data storage object. It’s analogous to a database. $scope itself is not the model, but you can store models in $scope. Each $scope has a parent $scope, all the way up to $rootScope forming a tree structure that loosely mirrors your DOM. When you call … Read more
Does C++ support compile-time counters?
Well… yes, template metaprogramming lacks side effects as it is intended. I was misled by a bug in older versions of GCC and a little unclear wording in the Standard to believe that all those features were possible. However, at least the namespace-scope functionality can be achieved with little use of templates at all. Function … Read more
Why give an “abstract: true” state a url?
The reason you would use an abstract state is to keep your definition dry when you have a part of your url non-navigable. For example, say that you had a url scheme like the following: /home/index /home/contact However, for whatever reason in your design, this url was invalid (i.e. no purpose for a page): /home … Read more
Why can’t I change my input value in React even with the onChange listener
Unlike in the case of Angular, in React.js you need to update the state manually. You can do something like this: <input id={‘todoName’ + this.props.id} className=”form-control” type=”text” value={this.state.name} onChange={e => this.onTodoChange(e.target.value)} /> And then in the function: onTodoChange(value){ this.setState({ name: value }); } Also, you can set the initial state in the constructor of the … Read more
How can I run an action when a state changes?
iOS 14.0+ You can use the onChange(of:perform:) modifier, like so: struct ContentView: View { @State private var isLightOn = false var body: some View { Toggle(“Light”, isOn: $isLightOn) .onChange(of: isLightOn) { value in if value { print(“Light is now on!”) } else { print(“Light is now off.”) } } } } iOS 13.0+ The following … Read more
Preserving global state in a flask application [duplicate]
Based on your question, I think you’re confused about the definition of “global”. In a stock Flask setup, you have a Flask server with multiple threads and potentially multiple processes handling requests. Suppose you had a stock global variable like “itemlist = []”, and you wanted to keep adding to it in every request – … Read more
Isn’t Redux just glorified global state?
Isn’t Redux just glorified global state? Of course it is. But the same holds for every database you have ever used. It is better to treat Redux as an in-memory database – which your components can reactively depend upon. Immutability enables checking if any sub-tree has been altered very efficient because it simplifies down to … Read more
What is the best way to add a value to an array in state
For now, this is the best way. this.setState(previousState => ({ myArray: […previousState.myArray, ‘new value’] }));