Json object to arrays for network graph

Question

I am trying to build a network graph which has the points data as [[from, to], [from,to]]. So, I need to build an array of this form from a JSON object. Can you give me a way that I can do it? I know, its just the way how we apply logic, but I tried lot many ways and I couldn't able to do it. Hence I am here to get a nice logic which applies for any depth of object.

My sample object is like

myObj = {
  Continents : 
  { Asia : {
      India : 1,
      China: 2 ,
      Japan : 3
    },
    Europe : {
      Sweden: 1,
      Norway : 2,
      Finland : 4,
      Denmark : 5
    },
    Africa : {
      Congo : 1,
      Kenya: 2,
      Zimbabwe : 3
    }
  }
}

Depth of the object can vary. And now I have to make an array to form nodes as below.

myArray = [['Continents', 'Asia'],
           ['Continents', 'Europe'],
           ['Continents'], 'Africa'],
           ['Asia','India'],
           ['Asia','China'],
           ['Asia','Japan'],
           ['Europe', 'Sweden'],
           ['Europe', 'Norway'],
           ['Europe', 'Finland'],
           ['Europe', 'Denmark'],
           ['Africa', 'Congo'],
           ['Africa', 'Kenya'],
           ['Africa', 'Zimbabwe'],
]

`Depth of the object can vary.` You need to explain the potential variations. We can only help with what you give us, which is currently a clearly defined structure. — Reinstate Monica Cellio, May 01 '19 at 11:56
@Archer If I get the solution for the posted object, I think I can make a solution out of it. — Sreehari, May 01 '19 at 11:58

score 1 · Accepted Answer · answered May 01 '19 at 12:01

1

You could use a recursive generator:

  function* pairs(obj, parent) {
    for(const [key, value] of Object.entries(obj)) {
       if(parent) yield [parent, key];
       if(typeof value === "object")
          yield* pairs(value, key);
    }
 }

Usable as:

  const result = [...pairs(obj)];

answered May 01 '19 at 12:01

Jonas Wilms

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Good solution. But seems it is works only in node.js and ES6. Its not working on Angular/Typescript – Sreehari May 01 '19 at 18:51

Json object to arrays for network graph

1 Answers1