When using Object.getOwnPropertyNames(window), the setTimeout function is not included in the resulting array

The issue at hand is that when using 

Object.getOwnPropertyNames(window)
, the setTimeout value is not included in the returned array.

Why is this happening?

In an attempt to further investigate, I tried checking the property descriptor object of the setTimeout property by using 

Object.getOwnPropertyDescriptor(window,"setTimeout")
, but it returned undefined. 

var windowProp = Object.getOwnPropertyNames(window);

for(var i=0; i< windowProp.length; i++){
    console.log(windowProp[i]);}
// The setTimeout value does not appear in the console output

Object.getOwnPropertyDescriptor(window,"setTimeout")
// Returns undefined
javascript

Answer №1

That is because the function setTimeout is not included in that list.

In Chrome, on this page, I see:

Date
EventEmitter
RegExp
adzerk2_inline_ly45m8gua792qbvm
careers_adselector
moveScroller
Function
encodeURIComponent
TypeError
ados_loadFIframe
_gat
careers_cssurl
PR_SHOULD_USE_CONTINUATION
decodeURIComponent
Number
i
sanitizeAndSplitTags
adFeedbackCastVote
adzerk2_html_rpcn4bbtg94kbrvw
genuwine
ados
Boolean
azScriptExtensionLoad
quantserve
eval
StackExchange
PR
isNaN
Array
styleCode
CTIsPlayback
unescape
external
zshow
tagRendererRaw
cssLinkLoad
apiCallbacks
Markdown
scriptSrc
NaN
escape
RangeError
adzerk2_func_fi5lor1t31ib0xu6
v8Intl
careers_leaderboardcssurl
azInitExtension
Object
EvalError
URIError
_gaq
parseFloat
isFinite
careers_companycssurl
uh
gauth
adzerk2_func_d1qd3ryzl0aanl1m
azScriptSRCLoad
_qevents
document
azLoad
decodeURI
__qc
windowProp
tagRenderer
undefined
prettyPrintOne
azHtmlLoad
azScriptInlineLoad
votesCast
SyntaxError
initFadingHelpText
Generator
showFadingHelpText
careers_adurl
jQuery
Infinity
String
prettyPrint
top
zItems
parseInt
JSON
WinterBash
azRegisterExtension
ReferenceError
cssLoad
Math
profileLink
encodeURI
window
Error
location
prepareEditor
initTagRenderer
gaGlobal
chrome
$
ados_frameLoaded
...
function to display the list of properties associated with Window.prototype instead:</p>

<pre><code>var windowProp = Object.getOwnPropertyNames(Window.prototype);

for(var i=0; i< windowProp.length; i++){
console.log(windowProp[i]);}

Object.getOwnPropertyDescriptor(Window.prototype,"setTimeout")
//object

This returns:

toString
webkitPostMessage
postMessage
close
blur
focus
ondeviceorientation
onwebkittransitionend
... // (Truncated for brevity)
btoa
addEventListener
removeEventListener
captureEvents
releaseEvents
getComputedStyle
getMatchedCSSRules
webkitConvertPointFromPageToNode
... // (Truncated for brevity)
constructor
Object

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