Object Destructuring In JavaScript

Object destructuring is a useful JavaScript feature used by developers to extract properties from any particular object. This function is also used to change properties into variables, extract multiple properties at once, and asses and find the default value of the said property. 

Another use case of object destructuring in JavaScript is to create variables with different aliases for similar objects or properties.

Functions and Arrow Functions in JavaScript

Arrow functions enable developers to write the JavaScript function more conveniently and concisely. Introduced in the ES6 version, the arrow functions improve the structure and readability. Arrow functions help reduce the coding size and complexity. However, it can not be used with different keywords or makes debugging difficult at times.

Array Method in JavaScript

The array is used in JavaScript to collect elements under the same variables. These arrays are resizable and can be used to store elements from individual data types. In JavaScript, the array method is some pre-built functions available that can be used on an Array. Having substantial knowledge of the JavaScript array method helps ReactJS developers improve their programming efficiency.

Rest and Spread Operators in JavaScript

Rest and spread operators are some of the key concepts JavaScript developers need to learn to master JavaScript. Represented by (...) or three dots, rest and spread operators help developers collect individual values to store them on a JavaScript object or array, to represent the rest of the values.

Spread operators on the other hand allow developers to expand on the array properties. Spread operators usually work in the opposite direction of a rest operator and can be used to retrieve different parameters stored in an array. In React JS this spread operator is used to pass properties to children components. This feature helps make the hierarchy between different components more reusable and reduces the amount of codes to be written manually.

Async Await in JavaScript

The Async/Await feature of JavaScript helps developers write asynchronous codes with ease and in a synchronous format. The use of the Async in JavaScript helps developers reduce the need for using nesting callback actions. These asynchronous properties of JavaScript handle time-consuming tasks like managing file operations and network requests. 

The async and await functions also improve the performance and readability of the codes written on ReactJS. 

Object-Oriented Programming or OOPs in JavaScript

Object-oriented programming is a much-used paradigm in software engineering, created using objects made of classes used to organize and structure codes. Although JavaScript does not support OOP concepts as a whole, it still uses some of the OOP concepts like inheritance, encapsulation, abstraction, and polymorphism. There are two kinds of object-oriented concepts in JavaScript: class-based OOP and function-based OOP.  

Modules in JavaScript

JavaScript modules are useful features of the programming language that break the written code into separate files, making them well-organized and reusable. Having previous knowledge and experience working with JavaScript modules helps developers manage dependencies and components more easily on ReactJS.