The reason why JSX was developed is our need for a more robust programming language than JavaScript. While it will be of particular value to people with no programming experience,even people who have used otherJSX is a statically-typed, object-oriented programming language compiling to standalone JavaScript. This section covers the basic concepts of JavaScript,as well as some frequent pitfalls for people who have not used JavaScript before. 1 JavaScript Basics Overview JavaScript is a rich and expressive language in its own right.

This is the power of the statically-typed language in terms of performance.Let's start by running our first JSX program: hello.jsx. JSX boosts performance by inline expansion: function bodies are expanded to where they are being called, if the functions being called could be determined at compile-time. Proxy classes and accessor methods, which often have negative impact on performance. JavaScript itself is not so slow but large-scale development tends to have many abstraction layers, e.g.

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