a custom object inspector to help me understand JavaScript

inspect.js

function escapeString(string) {
  string = string.replace(/\\/g, "\\\\").
                replace(/\n/g, "\\n").
                replace(/\r/g, "\\r").
                replace(/\t/g, "\\t");
  if (string.indexOf("'") < 0) {
    return "'" + string + "'";
  }
  string = string.replace(/"/g, "\\\"");
  return '"' + string + '"';
}
function escapeKey(string, enumerable) {
  if (!enumerable) { return "[" + string + "]"; }
  if ((/[a-z_$][a-z0-9_$]*/i).test(string)) {
    return string;
  }
  return escapeString(string);
}

function getType(object) {
  var proto = object.__proto__;
  if (!(proto && proto.constructor)) { return ""; }
  return proto.constructor.name;
}

function inspect(value, keyer, short) {
  if (value === undefined) { return "undefined"; }
  if (value === null) { return "null"; }
  if (value === true) { return "true"; }
  if (value === false) { return "false"; }
  switch (typeof value) {
  case 'object':
  case 'function':
    if (short) {
      return "(" + getType(value) + (Object.keys(value).length ? "..." : "") + ")";
    }
    var type = getType(value);
    var parts = keyer(value).map(function (key, i) {
      var prop = Object.getOwnPropertyDescriptor(value, key);
      if (prop.hasOwnProperty("value")) {
        return (i.toString() !== key ? escapeKey(key, prop.enumerable) + ": " : "") +
               inspect(prop.value, keyer, true);
      }
      if (prop.get) {
        if (prop.set) {
          return escapeKey(key, prop.enumerable) + ": [Getter/Setter]";
        }
        return escapeKey(key, prop.enumerable) + ": [Getter]";
      } else if (prop.set) {
        return escapeKey(key, prop.enumerable) + ": [Setter]";
      }
    });
    var body;
    if (parts.length) {
      body = " " + parts.join(", ") + " ";
      if (body.length > 77 - type.length) {
        body = "\n  " + parts.join(",\n  ") + "\n";
      }
    } else {
      body = "";
    }
    return "(" + type + body + ")";
  case 'number': return value.toString();
  case 'string': return escapeString(value);
  }
  throw new Error("Not Implemented");
}


var types = {
  Number: [Number, 42],
  String: [String, "Hello"],
  Date: [Date, new Date(Date.now())],
  RegExp: [RegExp, new RegExp("Find Me", "gi")],
  Object: [Object, {name: "Tim", age: 28}],
  Array: [Array, [1,2,3,4]],
  Buffer: [Buffer, new Buffer(4)],
  EventEmitter: [process.EventEmitter, process]
}
Object.keys(types).map(function (name) {
  var type = types[name][0],
      prototype = type.prototype,
      example = types[name][1];
  console.log("%s -> %s", name, inspect(type, Object.getOwnPropertyNames));
  console.log("%s.prototype -> %s", name, inspect(prototype, Object.getOwnPropertyNames));
  console.log("example %s -> %s\n", name, inspect(example, Object.getOwnPropertyNames));
});


var modules = ["http", "net", "url", "path", "querystring", "child_process", "step", "connect", "haml", "nstore"];
modules.map(function (name) {
  console.log("%s -> %s", name, inspect(require(name), Object.getOwnPropertyNames));
});

output.txt

Number -> (Function
  [NaN]: NaN,
  [arguments]: null,
  [NEGATIVE_INFINITY]: -Infinity,
  [POSITIVE_INFINITY]: Infinity,
  [length]: 1,
  [name]: 'Number',
  [MAX_VALUE]: 1.7976931348623157e+308,
  [prototype]: (Object),
  [caller]: null,
  [MIN_VALUE]: 5e-324
)
Number.prototype -> (Object
  [toExponential]: (Function),
  [toString]: (Function),
  [toLocaleString]: (Function),
  [toPrecision]: (Function),
  [valueOf]: (Function),
  [constructor]: (Function),
  [toFixed]: (Function)
)
example Number -> 42

String -> (Function
  [arguments]: null,
  [length]: 1,
  [name]: 'String',
  [prototype]: (Object),
  [fromCharCode]: (Function),
  [caller]: null
)
String.prototype -> (Object
  [length]: 0,
  [constructor]: (Function),
  [concat]: (Function),
  [localeCompare]: (Function),
  [substring]: (Function),
  [italics]: (Function),
  [charCodeAt]: (Function),
  [strike]: (Function),
  [indexOf]: (Function),
  [toLowerCase]: (Function),
  [trimRight]: (Function),
  [toString]: (Function),
  [toLocaleLowerCase]: (Function),
  [replace]: (Function),
  [toUpperCase]: (Function),
  [fontsize]: (Function),
  [trim]: (Function),
  [split]: (Function),
  [substr]: (Function),
  [sub]: (Function),
  [charAt]: (Function),
  [blink]: (Function),
  [lastIndexOf]: (Function),
  [sup]: (Function),
  [fontcolor]: (Function),
  [valueOf]: (Function),
  [link]: (Function),
  [bold]: (Function),
  [anchor]: (Function),
  [trimLeft]: (Function),
  [small]: (Function),
  [search]: (Function),
  [fixed]: (Function),
  [big]: (Function),
  [match]: (Function),
  [toLocaleUpperCase]: (Function),
  [slice]: (Function)
)
example String -> 'Hello'

Date -> (Function
  [now]: (Function),
  [arguments]: null,
  [UTC]: (Function),
  [length]: 7,
  [name]: 'Date',
  [prototype]: (Object),
  [caller]: null,
  [parse]: (Function)
)
Date.prototype -> (Object
  [constructor]: (Function),
  [toUTCString]: (Function),
  [setMinutes]: (Function),
  [setUTCMonth]: (Function),
  [getMilliseconds]: (Function),
  [getTime]: (Function),
  [getMinutes]: (Function),
  [getUTCHours]: (Function),
  [toString]: (Function),
  [setUTCFullYear]: (Function),
  [setMonth]: (Function),
  [getUTCMinutes]: (Function),
  [getUTCDate]: (Function),
  [setSeconds]: (Function),
  [toLocaleDateString]: (Function),
  [getMonth]: (Function),
  [toTimeString]: (Function),
  [toLocaleTimeString]: (Function),
  [setUTCMilliseconds]: (Function),
  [setYear]: (Function),
  [getUTCFullYear]: (Function),
  [getFullYear]: (Function),
  [getTimezoneOffset]: (Function),
  [setDate]: (Function),
  [getUTCMonth]: (Function),
  [getHours]: (Function),
  [toLocaleString]: (Function),
  [toISOString]: (Function),
  [toDateString]: (Function),
  [getUTCSeconds]: (Function),
  [valueOf]: (Function),
  [setUTCMinutes]: (Function),
  [getUTCDay]: (Function),
  [toJSON]: (Function),
  [setUTCDate]: (Function),
  [setUTCSeconds]: (Function),
  [getYear]: (Function),
  [getUTCMilliseconds]: (Function),
  [getDay]: (Function),
  [setFullYear]: (Function),
  [setMilliseconds]: (Function),
  [setTime]: (Function),
  [setHours]: (Function),
  [getSeconds]: (Function),
  [toGMTString]: (Function),
  [getDate]: (Function),
  [setUTCHours]: (Function)
)
example Date -> (Date)

RegExp -> (Function
  [$*]: [Getter/Setter],
  $3: [Getter/Setter],
  [$`]: [Getter/Setter],
  [arguments]: null,
  $9: [Getter/Setter],
  rightContext: [Getter/Setter],
  multiline: [Getter/Setter],
  [length]: 2,
  $7: [Getter/Setter],
  lastParen: [Getter/Setter],
  [$input]: [Getter/Setter],
  [$+]: [Getter/Setter],
  [$&]: [Getter/Setter],
  [name]: 'RegExp',
  leftContext: [Getter/Setter],
  $8: [Getter/Setter],
  $4: [Getter/Setter],
  [prototype]: (Object),
  $1: [Getter/Setter],
  [$']: [Getter/Setter],
  [$_]: [Getter/Setter],
  input: [Getter/Setter],
  [caller]: null,
  lastMatch: [Getter/Setter],
  $2: [Getter/Setter],
  $5: [Getter/Setter],
  $6: [Getter/Setter]
)
RegExp.prototype -> (Object
  [toString]: (Function),
  [constructor]: (Function...),
  [exec]: (Function),
  [compile]: (Function),
  [test]: (Function)
)
example RegExp -> (RegExp
  [lastIndex]: 0,
  [multiline]: false,
  [global]: true,
  [source]: 'Find Me',
  [ignoreCase]: true
)

Object -> (Function
  [getOwnPropertyNames]: (Function),
  [arguments]: null,
  [seal]: (Function),
  [length]: 1,
  [create]: (Function),
  [name]: 'Object',
  [isFrozen]: (Function),
  [keys]: (Function),
  [prototype]: (),
  [isExtensible]: (Function),
  [getOwnPropertyDescriptor]: (Function),
  [caller]: null,
  [preventExtensions]: (Function),
  [getPrototypeOf]: (Function),
  [defineProperty]: (Function),
  [isSealed]: (Function),
  [defineProperties]: (Function),
  [freeze]: (Function)
)
Object.prototype -> (
  [toString]: (Function),
  [__lookupGetter__]: (Function),
  [__defineGetter__]: (Function),
  [toLocaleString]: (Function),
  [hasOwnProperty]: (Function),
  [valueOf]: (Function),
  [__defineSetter__]: (Function),
  [constructor]: (Function),
  [propertyIsEnumerable]: (Function),
  [isPrototypeOf]: (Function),
  [__lookupSetter__]: (Function)
)
example Object -> (Object age: 28, name: 'Tim' )

Array -> (Function
  [arguments]: null,
  [length]: 1,
  [isArray]: (Function),
  [name]: 'Array',
  [prototype]: (Object),
  [caller]: null
)
Array.prototype -> (Object
  [length]: 0,
  [constructor]: (Function),
  [concat]: (Function),
  [map]: (Function),
  [sort]: (Function),
  [join]: (Function),
  [indexOf]: (Function),
  [filter]: (Function),
  [some]: (Function),
  [toString]: (Function),
  [reduceRight]: (Function),
  [splice]: (Function),
  [forEach]: (Function),
  [shift]: (Function),
  [unshift]: (Function),
  [toLocaleString]: (Function),
  [lastIndexOf]: (Function),
  [reverse]: (Function),
  [reduce]: (Function),
  [pop]: (Function),
  [push]: (Function),
  [every]: (Function),
  [slice]: (Function)
)
example Array -> (Array 1, 2, 3, 4, [length]: 4 )

Buffer -> (Function
  byteLength: (Function),
  [arguments]: null,
  isBuffer: (Function),
  [length]: 3,
  [name]: 'Buffer',
  poolSize: 8192,
  [prototype]: (Object...),
  [caller]: null,
  _charsWritten: 264
)
Buffer.prototype -> (Object
  binarySlice: (Function),
  utf8Write: (Function),
  utf8Slice: (Function),
  toString: (Function),
  inspect: (Function),
  binaryWrite: (Function),
  asciiSlice: (Function),
  set: (Function),
  copy: (Function),
  write: (Function),
  [constructor]: (Function...),
  asciiWrite: (Function),
  get: (Function),
  slice: (Function)
)
example Buffer -> (Buffer 252, 131, 196, 4, length: 4, offset: 4048, parent: (SlowBuffer...) )

EventEmitter -> (Function
  [arguments]: null,
  [length]: 0,
  [name]: 'EventEmitter',
  [prototype]: (Object...),
  [caller]: null
)
EventEmitter.prototype -> (Object
  on: (Function),
  removeListener: (Function),
  addListener: (Function),
  once: (Function),
  removeAllListeners: (Function),
  emit: (Function),
  [constructor]: (Function),
  listeners: (Function)
)
example EventEmitter -> (EventEmitter
  mainModule: (Module...),
  createChildProcess: (Function),
  setuid: (Function),
  binding: (Function),
  on: (Function),
  cwd: (Function),
  mixin: (Function),
  stdout: [Getter],
  unwatchFile: (Function),
  _tickCallback: (Function),
  title: 'node',
  compile: (Function),
  error: (Function),
  platform: 'PLATFORM',
  env: (...),
  version: 'v0.3.2',
  getgid: (Function),
  chdir: (Function),
  reallyExit: (Function),
  setgid: (Function),
  assert: (Function),
  execPath: '/home/tim/.nvm/v0.3.2/bin/node',
  exit: (Function),
  kill: (Function),
  pid: 9310,
  argv: (Array...),
  getuid: (Function),
  debug: (Function),
  memoryUsage: (Function),
  ARGV: (Array...),
  ENV: (...),
  removeListener: (Function),
  openStdin: (Function),
  _needTickCallback: (Function),
  installPrefix: '/home/tim/.nvm/v0.3.2',
  nextTick: (Function),
  versions: (Object...),
  watchFile: (Function),
  _kill: (Function),
  EventEmitter: (Function),
  dlopen: (Function),
  addListener: (Function),
  inherits: (Function),
  _byteLength: (Function),
  umask: (Function)
)

http -> (Object
  STATUS_CODES: (Object...),
  cat: (Function),
  parsers: (...),
  Server: (Function...),
  ClientRequest: (Function...),
  ServerResponse: (Function...),
  createServer: (Function),
  IncomingMessage: (Function...),
  OutgoingMessage: (Function...),
  createClient: (Function),
  Client: (Function...)
)
net -> (Object
  isIPv6: (Function),
  Server: (Function...),
  Stream: (Function...),
  createConnection: (Function),
  createServer: (Function),
  isIPv4: (Function),
  isIP: (Function)
)
url -> (Object
  resolveObject: (Function),
  resolve: (Function),
  format: (Function),
  parse: (Function)
)
path -> (Object
  extname: (Function),
  join: (Function),
  normalizeArray: (Function),
  split: (Function),
  normalize: (Function),
  basename: (Function),
  existsSync: (Function),
  exists: (Function),
  dirname: (Function)
)
querystring -> (Object
  decode: (Function),
  escape: (Function),
  stringify: (Function),
  unescapeBuffer: (Function),
  unescape: (Function),
  encode: (Function),
  parse: (Function)
)
child_process -> (Object spawn: (Function), execFile: (Function), exec: (Function) )
step -> (Function
  [arguments]: null,
  fn: (Function),
  [length]: 0,
  [name]: 'Step',
  [prototype]: (Object),
  [caller]: null
)
connect -> (Object
  middleware: (Object),
  Server: (Function...),
  createServer: (Function),
  version: '0.5.0',
  utils: (Object...)
)
haml -> (Function
  render: (Function),
  [arguments]: null,
  [length]: 2,
  [name]: 'Haml',
  [prototype]: (Object),
  execute: (Function),
  [caller]: null,
  optimize: (Function),
  compile: (Function)
)
nstore -> (Object
  remove: (Function),
  genKey: (Function),
  initialize: (Function),
  save: (Function),
  get: (Function),
  [new]: (Function),
  loadDatabase: (Function),
  length: [Getter],
  checkQueue: (Function)
)