The second big reason people like React is that it’s fast and efficient, especially for the case where data changes over time. React maintains its own virtual DOM in memory, and updates the ...

And so we have a way of basically rendering to a virtual DOM, throwing out the whole virtual DOM and re-creating it every time the data changes, and then React under the hood will convert that ...

Instead, virtual DOM based frameworks try to find the specific differences between two versions of the virtual DOM, often called diffing or reconciliation. Consider the React app shown in Figure 1.