How to use

difference

function

in

Collection

const getDiff = (configurations) => {
  const stagedConfig = _.filter(configurations, { state: CONFIG_STATE.STAGED });
  const currentConfig = _.filter(configurations, { state: CONFIG_STATE.CURRENT });

  return _(stagedConfig)
  .difference(currentConfig)
  .map(changedConfig => {
    const oldConfig = _.find(currentConfig, (config) => {
      return (config.id === changedConfig.id) && (config.host === changedConfig.host);
    });

    return _.assign(oldConfig, {
      diff: {
        old: oldConfig.value,
        new: changedConfig.value
      }
    });
  })
  .value();
}