lib/perf.js
function Perf (stats, name, filter, rename) {
  this.stats = stats
  this.name = name
  this.filter = filter || function () { return true }
  this.rename = rename || function (name) { return name }
}
function Perf (stats, name, filter, rename) {
  this.stats = stats
  this.name = name
  this.filter = filter || function () { return true }
  this.rename = rename || function (name) { return name }
}
function Perf ( stats , name , filter , rename ) { this . stats = stats this . name = name this . filter = filter || function ( ) { return true } this . rename = rename || function ( name ) { return name } }
Create a new Perf instance by passing it a filter
Create a new Perf instance by passing it a filter