var fieldvalues = { name: "hello there", mobile: "1234", meta: {status: "new"}, 

                      comments: [ {user: "john", comment: "hi"}, 

                               {user:"ram", comment: "hello"}]

                    };

​

// Objective: Convert this to a dotted notation like this

// { name: "hello there", .... "meta.status": "new", "comments.0.user": "john"

//   "comments.0.comment": "hi", "comments.1.user": "ram"......}

​

// This needs to be done using Functional Programming (using Ramda in this example)

​

var _toDotted = function(acc, obj) {

  var key = obj[0], val = obj[1];

  if(typeof(val) != "object") {  // Matching name, mobile etc

    acc[key] = val;

    return acc;

  }

  if(!Array.isArray(val)) {     // Matching meta

    for(var k in val)

      acc[key + "." + k] = val[k];

    return acc;

  }

  // Matching comments

  for(var idx in val) {

    for(var k2 in val[idx]) {

      acc[key + "." + idx + "." + k2] = val[idx][k2];

    }

  }

  return acc;

};

​

var toDotted = R.pipe(R.toPairs, R.reduce(_toDotted, {}));

console.log(toDotted(fieldvalues));

​