javascript source code of index

import React, { useState, useEffect } from 'react';
import Tree from './tree.js';
import { mergeData, isArray } from './utils.js';
import './style.css';
const JsonCompare = props => {
  let { oldData, newData } = props;
  let [data, setMergeData] = useState([]);

  useEffect(() => {
    setMergeData(mergeData(oldData, newData));
  }, [oldData, newData]);

  return (
    <pre className="c-json-view">
      <p className="c-json-outter">{isArray(newData) ? '[' : '{'}</p>
      {data.map((item, index) => (
        <Tree key={index} {...item} />
      ))}
      <p className="c-json-outter">{isArray(newData) ? ']' : '}'}</p>
    </pre>
  );
};

export default JsonCompare;