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Build a Collapsible Sidebar Menu

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01

Understand the problem

Build a sidebar with collapsible nested menu items.

ReactNavigationLayout
02

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Building a Collapsible Sidebar Menu in React

Mental model: One boolean — collapsed — drives the whole component. Collapsed shrinks the width and hides labels (icons remain); expanded shows both. Submenus track their own open set. CSS transitions on width make it feel smooth; labels are hidden, not unmounted

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04

React solution

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import React from 'react';
import Sidebar from './src/Sidebar';

export default function App() {
  return (
    <div style={{ fontFamily: 'sans-serif', padding: 0 }}>
      <Sidebar />
    </div>
  );
}
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