Expand Json based on child and parent relation

Question

I have following JSON data, If any one of the child name is matching with any of the parent name then i want to create new json set.

var PARENT_CHILD = {
  'Newton': ['Plato', 'Aristotle'],
  'Aristotle': ['Einstein'],
  'Plato': ['Tesla', 'Edison'],
  'Einstein': ['Hawking']
};

I want to convert it into like below:

 {
  "Newton": {
    "child": "Plato, Aristotle"
  },
  "Plato": {
    "parent": "Newton",
    "child": "Tesla, Edison"
  },
  "Aristotle": {
    "parent": "Newton",
    "child": "Einstein"
  },
  "Einstein": {
    "parent": "Aristotle",
    "child": "Hawking"
  },
  "Tesla": {
    "parent": "Plato"
  },
  "Edison": {
    "parent": "Plato"
  },
  "Hawking": {
    "parent": "Einstein"
  }
 }

Answer 1

You can use Array.reduce on the entries in PARENT_CHILD , creating a new entry in the output for the parent (if it doesn't already exist) and adding the child array to it, and then creating a new entry (with parent property) for each of the children of that parent:

 var PARENT_CHILD = { 'Newton': ['Plato', 'Aristotle'], 'Aristotle': ['Einstein'], 'Plato': ['Tesla', 'Edison'], 'Einstein': ['Hawking'] }; var result = Object.entries(PARENT_CHILD).reduce((acc, [parent, child]) => { if (acc[parent]) { acc[parent].child = child.join(', '); } else { acc[parent] = { child: child.join(', ') }; } child.forEach(name => acc[name] = { parent }); return acc; }, {}); console.log(result);