150. Virtual DOM V - JSX 2

JavaScript
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hard?  - accepted / - tried

This is a follow-up on 143. Virtual DOM IV - JSX 1.

Congratulations on your pass on problem 143!

Now in this problem, please modify your code to support following.

1. nesting elements

<p><i>BFE.dev</i> is <b>cool</b>!</p>

This means JSXChild needs to support JSXElement as well.

JSXChild:
   JSXText
+  JSXElement

2. Functional Component

As a convention, intrinsic HTML tags are lower cases and Functional Components have capitalized initials.

const Heading = 
  ({children, ...res}) => h('h1', res, ...children)
  
<Heading>BFE.<i>dev</i></Heading>

If your code in problem 143 already supports this, that's fantastic 👍! Just copy your code here and hope it shall pass.

Let's try to solve this problem within 20 mintues.

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