Q221. What is an event delegation?
Event delegation is a technique where you attach **one event listener to a parent element** instead of adding listeners to each child element. It works because events bub...
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Q222. Why are Redux state functions called reducers?
Reducers always return the accumulation of the state (based on all previous and current actions). Therefore, they act as a reducer of state. Each time a Redux reducer is ...
Q223. What is ECMAScript?
ECMAScript is the scripting language that forms the basis of JavaScript. ECMAScript standardized by the ECMA International standards organization in the ECMA-262 and ECMA...
Q224. How to make AJAX request in Redux?
You can use `redux-thunk` middleware which allows you to define async actions. Let's take an example of fetching specific account as an AJAX call using _fetch API_: ```ja...
Q225. What is JSON?
JSON (JavaScript Object Notation) is a lightweight format that is used for data interchanging. It is based on a subset of JavaScript language in the way objects are built...
Q226. Should I keep all component's state in Redux store?
**No.** In professional state architecture, keeping 100% of application state in a global Redux store is an anti-pattern. You should carefully separate **global server/cl...
Q227. What are the syntax rules of JSON?
Below are the list of syntax rules of JSON 1. The data is in name/value pairs 2. The data is separated by commas 3. Curly braces hold objects 4. Square brackets hold arra...
Q228. What is the proper way to access Redux store?
The best way to access your store in a component is to use the `connect()` function, that creates a new component that wraps around your existing one. This pattern is cal...
Q229. What is the purpose JSON stringify?
When sending data to a web server, the data has to be in a string format. You can achieve this by converting JSON object into a string using stringify() method. ```javasc...
Q230. What is the difference between component and container in React Redux?
**Component** is a class or function component that describes the presentational part of your application. **Container** is an informal term for a component that is conne...