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
I had a similar problem and I found out the answer after read this: Data gets set/updated/deleted in the store via the results of handling actions in reducers. Reducers receive the current state of a slice of your app, and expect to get new state back. One of the most common reasons that your components … Read more
You should create a BroadcastReceiver: public class CallReciever extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if (intent.getStringExtra(TelephonyManager.EXTRA_STATE).equals( TelephonyManager.EXTRA_STATE_RINGING)) { // Phone number String incomingNumber = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER); // Ringing state // This code will execute when the phone has an incoming call } else if (intent.getStringExtra(TelephonyManager.EXTRA_STATE).equals( TelephonyManager.EXTRA_STATE_IDLE) || intent.getStringExtra(TelephonyManager.EXTRA_STATE).equals( TelephonyManager.EXTRA_STATE_OFFHOOK)) { // … Read more
Use liftIO You’re already very close! Your suggestion newtype Op a = Op {runOp :: ST -> IO (ST, a)} is excellent and the way to go. To be able to execute getLine in an Op context, you need to ‘lift’ the IO operation into the Op monad. You can do this by writing a … Read more
The proper way of doing this would be by passing state as props to Docs component. However, because you are using React Router it can be accessed in a bit different way: this.props.route.param instead of default this.props.param So your code should look more or less like this: <Route path=”/docs” component={Docs} docs={this.state.docs} /> and {this.props.route.docs.map(function(study, key) … Read more
inject $state service to your controller, then in your controller… CONTROLLER $scope.changeState = function () { $state.go(‘where.ever.you.want.to.go’, {stateParamKey: exampleParam}); }; and add ng-click to your button HTML <button ng-click=”changeState()”>Change State</button>
According to mitchellh Can you start the machine manually (from the GUI)? This error message is usually indicative of VirtualBox issues. my solution I use vagrant under windows though, I solved this problem by simply kill all the VirtualBox process, and restart VirtualBox GUI, start the VM, then normally power off it. maybe useful links … Read more
In Chrome (and apparently Firefox), there is a special copy() method that will copy the rendered content to the clipboard. Then you can do whatever you want by pasting it to your preferred text editor. https://developers.google.com/chrome-developer-tools/docs/commandline-api#copyobject Console Example: copy(document.body.innerHTML); Note: I noticed Chrome reports undefined after the method is run, however, it seems to execute … Read more
There is a very simple theory to why you should use useMemo to memoize the values passed to the Context Provider. When you pass the value to Context Provider, either as an object or an array like: return <CountContext.Provider value={{state, setCount}} {…props} /> or return <CountContext.Provider value={[state, setCount]} {…props} /> What essentially happens is that … Read more
Add android:configChanges in the Manifest file <activity name= “.MainActivity” android:configChanges=”orientation|screenSize”/> By default, this does not work because changing the orientation causes the onCreate method to be called again and redraws the view. However, if this parameter is included, the framework will handle preserving the state of the screen or layout if the orientation is changed. … Read more