'use strict'

function id (e) { return e }
var prop = require('../util/prop')
var drain = require('./drain')

module.exports = function find (test, cb) {
  var ended = false
  if(!cb)
    cb = test, test = id
  else
    test = prop(test) || id

  return drain(function (data) {
    if(test(data)) {
      ended = true
      cb(null, data)
    return false
    }
  }, function (err) {
    if(ended) return //already called back
    cb(err === true ? null : err, null)
  })
}