2018-09-02 Recursively search and update a json javascript object

2018-09-02 recursively-search-and-update-a-json-javascript-object

# Title: Recursively search and update a json javascript object
# Author: Mikael Lundin
# Date: 2018-09-02

update.js

// findObjectById: helper function
// comment: will recurse through an object graph, looking for matching Id's and run the update function
const findObjectById = (obj, id, updateFn) => {
  // have found the object
  if (obj["Id"] === id) {
    return updateFn(obj);
  }
  else {
    // iterate over the properties
    for (var propertyName in obj) {
      // any object that is not a simple value
      if (obj[propertyName] !== null && typeof obj[propertyName] === 'object') {
        // recurse into the object and write back the result to the object graph
        obj[propertyName] = findObjectById(obj[propertyName], id, updateFn);
      }
    }
  }
  return obj;
};

usage.js

var animals = {
    anything {
        ID = '123',
        Name = {
            'en': 'Phoney Pony'
        }
    }
};

var updateFn = obj => {
    obj.Name['sv-SE'] = 'Fånig ponny'
};

var result = findObjectById(animals, '123', updateFn);

// the result will look like this
// var animals = {
//     anything {
//         ID = '123',
//         Name = {
//             'en': 'Phoney Pony',
//             'sv-SE': 'Fånig ponny'
//         }
//     }
// };