promise-tap.md

Promise.all(map(API.userByName, users))
  .tap(function(users) {
    req.log.info({ users: users });
  })

Promise.all(map(API.userByName, users))
  .tap(compose( req.log.info, createMapEntry('users') ))

// no go -- [TypeError: Object.keys called on non-object]

Promise.all(map(API.userByName, users))
  .tap(compose( req.log.info.bind(req.log.info), createMapEntry('users') ))

// works but imo on the same level on ugly scale as the first one 

Promise.all(map(API.userByName, users))
  .tap(users => req.log.info({ users }))

// probably prefer this most but requires transpiler

would this work:

Promise.all(map(API.userByName, users))
  .tap(compose( R.bind(req.log.info, req.log), createMapEntry('users') ))

?

not much of an improvement, really 😺

@CrossEye recommends:

var logInfo = R.bind(req.log.info, req.log);
Promise.all(map(API.userByName, users))
  .tap(compose(logInfo, createMapEntry('users') ))