Consider the below code snippet:function counter(state = { count: 0 }, action) { const count = state.count switch (action.type) { case 'increase': return { count: count + 1 } default: return state }}var store = createStore();What would be the value of the state if the store.getState() method is invoked?state= {count: 0}state= {count: 1}Error since reducer is not bound to storeNo Output
Question
Consider the below code snippet:function counter(state = { count: 0 }, action) { const count = state.count switch (action.type) { case 'increase': return { count: count + 1 } default: return state }}var store = createStore();What would be the value of the state if the store.getState() method is invoked?state= {count: 0}state= {count: 1}Error since reducer is not bound to storeNo Output
Solution
The value of the state when the store.getState() method is invoked would be an error since the reducer is not bound to the store. The createStore() function needs to be invoked with the reducer as its argument for the store to have an initial state and to know how to handle actions. The correct code would be:
var store = createStore(counter);
In the provided code, createStore() is called without any arguments, so the store doesn't know about the 'counter' reducer and its initial state. Therefore, calling store.getState() would result in an error.
Similar Questions
If we use useState for the following code then which of the following code carry out the same operation that this reducer is doing <button onClick={() => dispatch({type: 'decrement'})}>-</button> <button onClick={() => dispatch({type: 'increment'})}>+</button>A<button onClick={() =>setState(state-1)}>-</button><button onClick={() =>setState(state+1)}>+</button>B<button onClick={() =>setState(-1)}>-</button><button onClick={() =>setState(1)}>+</button>C <button onClick={setState(state-1)}>-</button><button onClick={setState(state+1)}>+</button>D <button onClick={setState(-1)}>-</button><button onClick={setState(1)}>+</button>
The counter is passed with the initial value 0 to the reducer and the counter will be incremented by 1 when the increment button is clicked. When clicked on the increment button CallIncrement() function is called. The action file is as shown below /* action file */ function onIncrement(step){ return { type:"INC", step } } export function CallIncrement(){ return (dispatch,getState)=>{ setTimeout(()=>{ console.log(getState()) dispatch(onIncrement()); },3000) } } What value would be logged to the console when the increment button is clicked for the third time? Error because getState() method can be called only using store object 3 2 Error because getState() method cannot be called within middleware function
Which of the following is true regarding Reducers?a. Reducers accept the current state and actionb. Reducers accept only initial statec. Reducers are pure functionsd. Reduces returns the new state to the storeBoth a and cOnly bOnly aa, c and d
Consider the following code Identify the problem with code and choose the correct code from the following this.setState({ counter:this.state.counter+this.props.increment, }) A this.setState([ counter: state.counter+this.props.increment, }) B this.setState([ counter:this.state.counter + props.increment, }) C this.setState((state, props) => ({ counter: state.counter + props.increment, })) D this.setState((state, props) => ({ counter: state.counter+this.props.increment, }))
Order the below steps to match the data flow in Redux a. The root reducer combines the new state returned from multiple reducers into a single state b. Component dispatches an action c. The store gets the initial state from root reducer passed to it d. The action reaches the root reducer e. Store saves the entire state of the application c,b,d,a,e c,b,a,d,e a,c,b,d,e a,c,d,b,e
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