state

Replace individual list elements in Haskell?

Typically, you modify elements of a list by splitting the list, replacing an element, and joining it back together. To split a list at an index, we have: splitAt :: Int -> [a] -> ([a], [a]) which you can use to break up a list, like so: > splitAt 2 [“Off”,”Off”,”Off”,”Off”] ([“Off”,”Off”],[“Off”,”Off”]) now you just … Read more

Angularjs ui-router. How to redirect to login page

The point is, do not redirect if not needed === if already redirected to intended state. There is a working plunker with similar solution .run(function($rootScope, $location, $state, authenticationSvc) { $rootScope.$on( ‘$stateChangeStart’, function(e, toState , toParams , fromState, fromParams) { var isLogin = toState.name === “login”; if(isLogin){ return; // no need to redirect } // now, … 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

Nuxt.js vuex store not persisted

Alright, so the behavior is totally logic. Vuex is not supposed to be persistent. For any persistence on the front-end, you need either: cookies localStorage pass it in the URL (query params) IndexedDB get the data back from making a call to a backend Some of the packages here may be useful: https://github.com/vuejs/awesome-vue#persistence If you … Read more

Add element to a state React

As per React docs (webarchive source): What Should Go in State? State should contain data that a component’s event handlers may change to trigger a UI update. In real apps this data tends to be very small and JSON-serializable. When building a stateful component, think about the minimal possible representation of its state, and only … Read more