You are undoubtedly making mistakes in your learning if, when learning React, you become stuck on the questions of this nature. Without a doubt, ReactJS is the most widely used library among front-end developers, and that popularity is only growing. The ReactJS-powered website looks stunning, and the majority of development newbies are drawn to the Facebook-developed framework as well. However, many developers and seasoned professionals make the mistake of diving headfirst into ReactJS (or another library and framework) without understanding the prerequisites. You will have a lot of difficulties understanding this library and performing well in interviews if you jump right to React.
If you are asked questions about ES6, JSX, Babel, Package Manager, basic javascript, or other core ideas during your interview, you will become confused. Before moving on to the React, there are a few prerequisites and fundamental ideas that will be covered. These fundamental ideas will also make it easier for you to learn different javascript frameworks and libraries in the future.
1. HTML and CSS
With HTML and CSS, every front-end developer begins their work. Therefore, you should be proficient in coding HTML and CSS before you begin learning how to react. You need to understand how to create semantic HTML tags, write CSS selectors, utilise classes, implement a CSS reset, the box model, reset to border-box, and flexbox, as well as how to create responsive web apps with media queries and create front-end applications using HTML and CSS.
2. Babel & JSX (Javascript XML)
You will work with JSX, which has an HTML-like appearance and may be thought of as JavaScript with an HTML flavour, in React. You might say that it is an extension of the syntax of the Javascript language because it is the simplest way to add HTML code inside of Javascript. Before you begin learning React, you should have a firm grasp of what JSX is.
3. Basics of ES6 and Javascript
Whatever the case, If your understanding of Javascript's fundamentals is unclear, you cannot improve at React. It is one of the crucial abilities to master before responding in an interview. One of the hardest languages for developers to understand is Javascript, which also ignores little mistakes that, if you don't catch them right away, might cause problems for your project. So be sure to first understand the fundamentals of javascript before moving on to the more complex forms of ECMAScript5 and ECMAScript6. Some of the topics are listed below, however for comprehensive javascript understanding, make sure you investigate as much as you can and create some projects.
Keep in mind that learning the fundamentals of javascript will help you understand any framework, but if the concept is unclear, you will run into problems with any javascript framework. Before going on to React, the interviewer will also test your Javascript foundations.
Start by defining your notions clearly for variables, numbers, booleans, and strings. Then, go on to other very basic foundations. Create a simple app, such as a calculator, to see how everything interacts.
Find out about basic concepts such as operators, conditionals, functions, loops, javascript keywords, arrays, and objects.
The way the 'this' keyword operates, event management, and DOM manipulation are all completely different in javascript (which is confusing for most of the developers).
state (how state and the setState() function function), higher-order function, callback function, and arrow function Other features of ES5 and ES6 include scope, class & constructors, extends and inheritance, map, reduce, filter, promises, modules, closures, const, let (difference between var, let, and const), and others.
4. A package manager using Node and Npm
You will need to install numerous, smaller software packages when using ReactJS. All the files required for a module are contained in a package in javascript, and modules are the javascript libraries that may be used with the Node project. Js files and package.json files are both included in packages. To install these packages, you need a reliable installer that will make it simple for you to download and set up software without having to worry about dependencies. NPM (Node package management), which helps you install and manage javascript products, is involved in this situation. These software packages can be managed using NodeJs or Yarn. Installing Node.js first allows you to install NPM. NPM will be installed automatically when Node.js is installed.
You should therefore be well-versed in NPM (Node package manager) registry and package installation techniques before switching to React. The submitted file is tracked by the NPM registry. Anyone may upload these files (packages or modules). In a nutshell, the NPM registry is the location where developers go to obtain the software needed to create software.
Let's say someone has created a truly helpful javascript file. He or she pushes it to the NPM registry because they believe others might use it. It is accessible to others who can get it for their own use through the NPM online registry.
5. Git and CLI (Command Line Interface)
To store their project on GitHub, Bitbucket, and GitLab, developers must also be proficient in Git (version control) (Code hosting platform). The ability to manage and store several project file versions makes it easier for developers to collaborate and work together. You should be well-versed in the operations of Git and various code hosting sites. Learn how to utilize all the commands such as push, pull, add, commit, etc. since developers need them to track the version of your files. Learn about branching, merging conflicts, and other related topics.
CLI will be used to assist you in performing every action in React (Command-line interface). You should really get in the habit of utilizing CLI because it can be used for many different tasks, like installing packages, using NPM, building and executing React apps, and much more. Here is an example of how to use the CLI to run a react application.
To Learn Complete reactjs, check out the reactjs tutorial which provides a comprehensive guide and covers all the topics
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