How to use

countBy

function

in

Collection

_(config)
 .flatMap(service => service)
 .map(url => exports.parseUrl(url))
 .map(data => `${data.host}${data.pathname}:${data.port}`)
 .countBy()
 .value()

const count = _(result)
  .flatten()
  .countBy()
  .value();