JavaScript concepts to master before learning React

React, a JavaScript library for building user interfaces, relies heavily on various JavaScript features and patterns, particularly those introduced with ES2015. Aspiring React developers are encouraged to master key JavaScript concepts such as conditional logic, object literals, template literals, and array functions to effectively use React. The article emphasizes the importance of understanding JavaScript fundamentals such as destructuring, the spread operator, and callback functions, which are integral to React development. Additionally, it highlights the shift from class-based components to function components with React Hooks, which allow similar functionalities without the need for classes. The guide suggests that understanding these JavaScript principles will provide a smoother learning curve for those new to React, enabling them to write more concise and efficient code.