Sparrow.js

function EmployeeGraph() {
  this._nextEmployeeId = 0;
  this._employeeGraph = {}
  this.allowedWriteFields = {
    employee: ['firstName', 'lastName'],
    organization: ['workEmail', 'jobTitle']
  }
  this.allowedReadFields = {
    employee: new Set(['firstName', 'lastName']),
  }
  this.log = [];
}

EmployeeGraph.prototype.addEmployee = function (firstName, lastName, dateOfBirth, jobTitle, workEmail, personalEmail, specialistNotes) {
  this._employeeGraph[this._nextEmployeeId] = {firstName, lastName, dateOfBirth, jobTitle, workEmail, personalEmail, specialistNotes}
  this._nextEmployeeId++;
}

EmployeeGraph.prototype.modification = function(title, modifications, id) {
  // make sure id is valid
  const allowedFields = new Set(this.allowedWriteFields[title]); // all but specialistNotes
  for (let field in modifications) {
    // console.log(field);
    if (allowedFields.has(field)) {
      // console.log(this._employeeGraph[id][field])
      this._employeeGraph[id][field] = modifications[field];
    }
  }
  this.log.push({type: 'write', fields: modifications, id});
}

EmployeeGraph.prototype.viewEmployee = function(title, fields, id) {
  const results = {};
  fields.forEach(field => {
    if (this.allowedReadFields[title].has(field)) {
      results[field] = this._employeeGraph[id][field];
    }
  })
  this.log.push({type: 'read', fields, id});
  return results;
}

const newCompany = new EmployeeGraph();
newCompany.addEmployee('Matt', 'Goldwater', '07171991', 'Software Engineer', '[email protected]', '[email protected]', 'fooBar')
newCompany.addEmployee('Matthias', 'Silverwater', '07101900', 'Software Engineering Manager', '[email protected]', '[email protected]', 'fooBarfa')
// console.log(newCompany._employeeGraph);
newCompany.modification('employee', {firstName: 'Sebastian', middleName: 'Jordan', specialistNotes: 'foofoo'}, 0)
newCompany.modification('organization', {firstName: 'Matt', middleName: 'Jordan', workEmail: '[email protected]'}, 0)
newCompany.modification('organization', {firstName: 'Bob', middleName: 'Jordan', workEmail: '[email protected]'}, 1)
console.log(newCompany.viewEmployee('employee', ['firstName', 'middleName', 'specialistNotes'], 0));
console.log(newCompany.viewEmployee('employee', ['firstName', 'middleName', 'specialistNotes'], 1));
// console.log(newCompany._employeeGraph);
console.log(newCompany.log);