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
Question
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
Solution
The value that would be logged to the console when the increment button is clicked for the third time would be the current state of the store before the third increment action is dispatched. However, since the onIncrement action does not take any arguments, the step property of the action object will be undefined.
The getState function returns the current state of the Redux store, so it will log the state of the store at the moment it is called. This means that if the state of the store changes between when the action is dispatched and when the getState function is called, the logged value will reflect the state of the store at the moment getState was called, not when the action was dispatched.
Without more context, it's impossible to say exactly what value will be logged. It will depend on what other actions have been dispatched and how the reducer function handles those actions. If the only action that has been dispatched is onIncrement, and the reducer increments the counter each time it handles an onIncrement action, then the value logged would be 2 (since the counter starts at 0 and has been incremented twice before the third click). However, if other actions have been dispatched that affect the counter, the logged value could be different.
Similar Questions
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