beginner react startup code example

Example 1: how react work

React creates a VIRTUAL DOM in memory.
Instead of manipulating the browser's DOM directly, 
React creates a virtual DOM in memory, 
where it does all the necessary manipulating, 
  before making the changes in the browser DOM.
then changes only what needs to be changed

Example 2: react documentation

class Board extends React.Component {
  renderSquare(i) {
    return <Square value={i} />;  }
}

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