A simple problem of increasing a variable

JavaScript
#1

Tell us what’s happening:

How to increase count every time dispatches occurs

Your code so far


const ADD = 'ADD';

const reducer = (state = 0, action) => {
switch(action.type) {
  case ADD:
    return state + 1;
  default:
    return state;
}
};

const store = Redux.createStore(reducer);

// global count variable:
let count = 0;

// change code below this line

// change code above this line

store.dispatch({type: ADD});
console.log(count);
store.dispatch({type: ADD});
console.log(count);
store.dispatch({type: ADD});
console.log(count);

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.125 Safari/537.36.

Challenge: Register a Store Listener

Link to the challenge:

#2

What is your question? The instruction is:

Write a callback function that increments the global variable count every time the store receives an action, and pass this function in to the store.subscribe() method. You’ll see that store.dispatch() is called three times in a row, each time directly passing in an action object. Watch the console output between the action dispatches to see the updates take place.

If you want to pass a callback to store.subscribe, you do it like:

store.subscribe(callback);  //callback is a function which increments count
1 Like
#3

thanks buddy for this,I was doing a silly mistake here.

#4