React uses which memory for Virtual DOM?

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 React's Virtual DOM is not tied to a specific memory model in the traditional sense. However, when we talk about the Virtual DOM and its memory usage, we are referring to how React handles the virtual representation of the actual DOM in memory. Here's how it works:

Virtual DOM Memory Model:

  • In-Memory Representation: The Virtual DOM is essentially an in-memory representation of the actual DOM. It is a lightweight, JavaScript object that mirrors the structure of the real DOM.

  • JS Objects: The Virtual DOM is a tree of JavaScript objects that describe the UI components and their properties. React creates this tree (usually referred to as "virtual nodes" or "React elements") in memory.


    const element = React.createElement('div', { className: 'container' }, 'Hello World');

  • No Actual Memory Allocation: Unlike physical memory used for storing raw data, the Virtual DOM in React is just a plain JavaScript object structure that holds metadata about the real DOM. This structure is transient and is not stored persistently but exists in memory during the lifecycle of React components.

  • Efficient Diffing Algorithm: When the state or props of a component change, React computes the "diff" between the current Virtual DOM and the previous one. The "diff" is used to determine which parts of the real DOM need to be updated. This diffing process allows React to minimize the number of updates to the actual DOM, thereby improving performance.

Memory Usage:

  • Heap Memory: Since the Virtual DOM is stored as JavaScript objects, it resides in the heap memory of the browser. The heap is the memory space used for dynamic memory allocation.
  • Optimizations: React optimizes memory usage by using techniques like "reconciliation" and "batched updates." React only updates the parts of the DOM that have changed, and it reuses the components whenever possible to reduce memory consumption.

Summary:

  • React uses heap memory to store the Virtual DOM as JavaScript objects.
  • It operates in memory temporarily during the rendering process and performs efficient updates using the diffing algorithm to minimize changes to the real DOM.

React's Virtual DOM does not directly interact with low-level memory management like stack memory or manual memory allocation. Instead, it focuses on optimizing the interaction between JavaScript objects (Virtual DOM) and the browser's actual DOM.

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