Function Path for crehana 🗼

function.js

const getIn = (obj, path, defaultValue) => {
  var _path = path.split('.');
  var _obj = Object.assign({}, obj);
  var head;
  while(typeof _obj == 'object' && _path.length > 0) {
    [head, ..._path] = _path;
    _obj = _obj[head];
  }

  return _obj || defaultValue;
}

var object = { 'a': [{ 'b': { 'c': 3 } }], 'b': [{a: 'a'}] };
console.log(getIn(object, 'a.b.c', 'default'));
// => 'default'

var object2 = {a: { b: { c: 3 } } };     
console.log(getIn(object2, 'a.b.c', 5));
// => 3
console.log(getIn(object2, 'a.b.d', 5));
// => 5

// Credits @gilesbradshaw => destructuring is insane => https://gist.github.com/mikaelbr/9900818

Update code for this case:

var object = {a: { b: { c: 3 } } };     
console.log(getIn(object, 'a.b', 5));
// => { c: 3 }