code: function setField(object, fieldPath, value) {
    let currentObject = object
    let fieldNames = fieldPath.split(".")
    
    for (let fieldName of fieldNames.slice(0, -1)) {
      if (!currentObject.hasOwnProperty(fieldName)) {
        currentObject[fieldName] = {}
      }
      
      currentObject = currentObject[fieldName]
    }
    
    currentObject[fieldNames.pop()] = value
  }
docs: Sets the field at the specified field path to the provided value in the
  provided object.
  
  The function creates the field path out of empty plain objects if it does
  not already exist.
  
  @param {Object} object The object in which the specified field path should
  be set to the provided value.
  @param {string} fieldPath The field path at which the value should be set.
  The field path must be a sequence of valid ECMAScript identifiers
  separated by dots.
  @param {*} value The value to set.