How to use the createLogger function from redux-logger

redux-logger.createLogger is a function in the Redux-Logger library that creates a middleware that logs actions and state changes in a Redux store.

How does redux-logger.createLogger work?

redux-logger.createLogger works by creating a middleware function that intercepts actions dispatched to a Redux store and logs them along with the previous and next state of the store.

When called, redux-logger.createLogger takes an optional configuration object that allows you to customize the behavior of the logger middleware. For example, you can specify which log level to use, whether to log the previous and next state of the store, and which parts of the state to filter out of the logs.

The resulting middleware function returned by redux-logger.createLogger can then be passed to the applyMiddleware method when creating your Redux store, allowing it to log actions and state changes as they occur.

By default, the logger middleware logs actions and state changes in a colored, human-readable format to the console using the console.groupCollapsed and console.groupEnd methods. This can help make it easier to understand what actions are being dispatched and how they are affecting the state of your Redux store.

Ai Example

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import { createStore, applyMiddleware } from "redux";
import logger from "redux-logger";

// define a reducer function for the store
function counterReducer(state = { count: 0 }, action) {
  switch (action.type) {
    case "INCREMENT":
      return { count: state.count + 1 };
    case "DECREMENT":
      return { count: state.count - 1 };
    default:
      return state;
  }
}

// create a Redux store with the logger middleware
const store = createStore(counterReducer, applyMiddleware(logger));

// dispatch some example actions
store.dispatch({ type: "INCREMENT" });
store.dispatch({ type: "INCREMENT" });
store.dispatch({ type: "DECREMENT" });

In this example, we're using redux-logger.createLogger to create a middleware function that logs actions and state changes in a Redux store. We first define a reducer function for the store that updates a counter value in the store's state in response to "INCREMENT" and "DECREMENT" actions. We then create a new Redux store with createStore, passing in the reducer function and the logger middleware returned by redux-logger.createLogger. We then dispatch some example actions to the store using store.dispatch. Because we're using the logger middleware, these actions will be logged to the console along with the previous and next state of the store. When we run this code, it might output the following log messages to the console: shell Copy code