old_contents: var forOwn = require('./forOwn')
  
  function reject (obj, fn) {
    var result = {}
    var key
  
    forOwn(obj, function (val, key) {
      if (!fn(obj[key], key, obj)) result[key] = obj[key]
    })
  
    return result
  }
  
  module.exports = reject
  
new_contents: var forOwn = require('./forOwn')
  
  function reject (obj, fn) {
    var result = {}
  
    forOwn(obj, function (val, key) {
      if (!fn(obj[key], key, obj)) result[key] = obj[key]
    })
  
    return result
  }
  
  module.exports = reject
  
subject: update object/reject — remove un-used variable