Скачать или смотреть React's New Activity Component – Fix Conditional Rendering Forever

Tired of losing state in React? Meet React 19's brand-new Activity component – the perfect solution for conditional rendering without resets or performance waste.

In this beginner-friendly tutorial we cover:
• Why old conditional rendering ({condition && Component }) destroys state
• Why display: none wastes resources
• How Activity mode="visible" | "hidden" fixes both problems
• Line-by-line dashboard sidebar example (dark mode)
• Real-world use cases: sidebars, tabs, multi-step forms, drawers
• Live before/after demo showing preserved search inputs & selections

Perfect for React developers upgrading to React 19 / 19.2 in 2026!

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