updated() and removed()

updated_removed.js

const updated = (source, property, value) => {
  const out = {};
  Object.keys(source).forEach(key => {
    out[key] = source[key];
  });
  out[property] = value;
  return out;
};

const removed = (source, property) => {
  const out = {};
  Object.keys(source).filter(key => key !== property).forEach(key => {
    out[key] = source[key];
  });
  return out;
};