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Common causes of memory leaks in extensions - Extensions
storing references to window objects and dom nodes the most common problem is extensions
holding onto references to content windows for too long.
... a similar problem is
holding onto window objects or dom nodes (such as window.document) for too long by storing them in a javascript module.
...for example: function implicitdeclarationleak(window) { // implicit variable declaration in the js global,
holding a strong ref to the document doc = window.document; } implicitly declared variables can be avoided by using ecmascript 5's strict mode.
...And 3 more matches
Addon
pendingoperations read only integer a bitfield
holding all of the current operations that are waiting to be performed for this add-on.
... permissions read only integer a bitfield
holding all the the operations that can be performed on this add-on.
... contributors read only addonauthor[] an array of strings
holding the contributors of the add-on.
...And 3 more matches
OS.File for the main thread
promise resolves to an array
holding bytes bytes (or less if the file did not contain as many bytes).
... promise resolves to an instance of file.info
holding information about a file.
... data an arraybufferview
holding the data to write.
... promise<file.info> stat() promise resolves to an instance of file.info
holding information about the file.
Investigating leaks using DMD heap scan mode
for instance, if you think that an nsfoo object might be
holding your leaking object alive, you can use this to easily see if we leaked an nsfoo object.
... figure out what is
holding the leaking object alive.
...for instance, if the script element was being held alive by some container being held alive by a runnable, we’d first need to figure out that the container was
holding the element.
... if it isn’t possible to figure out what is
holding that alive, you’d have to run block_analyzer again.
XPCOM array guide
when
holding pointers, doesn't own the pointer.
...when
holding pointers, doesn't own the pointer.
... for example, to remove three objects, starting at the third object in the array (that is, the object with index value 2): myarray.removeobjectsat(2, 3); nstarray<t> nstarray<t> is a typesafe array for
holding various objects.
...without
holding a reference to the owner, the enumerator could be left with a dangling pointer to a deleted nstarray<nsstring>.
Weak reference
when you hold an owning reference on an object (i.e., you have addrefed it), you are
holding that object in existence for the duration of your reference.
... { // ...but to use my weak reference, i'll need a (short-lived) owning reference nscomptr<nsifoo> tempfooptr = do_queryreferent(weakptr); if ( tempfooptr ) tempfooptr->somefoomethod(...); // else, the `real' object has gone away } in a real world example, however, you are more likely to be
holding a weak reference in a member variable.
...so, instead of
holding an owning reference to an nsiobserver, it holds a weak reference.
... it really feels like the nsiweakreference that you are
holding is just another interface on the target object.
Implementing controls using the Gamepad API - Game development
it takes two parameters — the button we want to listen to and the (optional) way to tell the game that
holding the button is accepted.
...to check if the press is a new one, so the player is not
holding the key, we loop through the cached states of the buttons from the previous frame of the game loop.
...in this case, pressing or
holding a will fire the bullet and pressing b will pause the game.
HTML parser threading
the termination and interruption indicators are guarded by a more narrowly scoped mterminatedmutex, so parseavailabledata() has the opportunity to receive an order to terminate or interrupt even while the parser thread is
holding mterminatedmutex.
...it acquires mspeculationmutex and while
holding it, it creates a new speculation and adds it to the queue of speculations, flushes the tree ops to the main thread, marks the nshtml5streamparser as being in a speculating state and sets the newly created speculation object as the tree op sink (instead of the tree op stage described earlier) of the tree builder.
...if there is more than one speculation in the queue and if the speculation is successful, we can dequeue the first speculation while
holding mspeculationmutex without bothering the parser thread.
OS.File.Info
platform-specific attributes unix unixowner a number
holding the identifier of the unix owner of this file.
... unixgroup a number
holding the identifier of the unix group of this file.
... unixmode a number
holding the unix access rights to this file.
Index - Web APIs
326 bluetoothremotegattcharacteristic.readvalue() api, bluetooth, bluetoothremotegattcharacteristic, experimental, property, reference, web bluetooth api, readvalue the bluetoothremotegattcharacteristic.readvalue() method returns a promise that resolves to a dataview
holding a duplicate of the value property if it is available and supported.
... 335 readvalue() api, bluetooth, bluetoothgattdescriptor, bluetoothremotegattdescriptor, experimental, method, reference, web bluetooth api, readvalue() the bluetoothremotegattdescriptor.readvalue() method returns a promise that resolves to an arraybuffer
holding a duplicate of the value property if it is available and supported.
...for example, if a user were
holding a virtual straight rod, the native origin of this xrspace would be the approximate center of the user's curled fingers.
KeyboardEvent.key - Web APIs
as we keep
holding this key, the keydown event does not continue to fire repeatedly because it does not produce a character key.
...as we keep
holding this key, the keydown event does not continue to fire repeatedly because it produced no character key.
...as we keep
holding the key, the keydown event continues to fire repeatedly and the keyboardevent.repeat property is set to true.
NPVariant - Archive of obsolete content
stringz_to_npvariant() initialize v to a variant of type npvarianttype_string with the value being an npstring
holding the utf-8 string value val.
... stringn_to_npvariant() initialize v to a variant of type npvarianttype_string with the value being an npstring
holding the utf-8 string value val with the length len.
Responsive images - Learn web development
returning to our original not-responsive.html example, we have an image that badly needs art direction: <img src="elva-800w.jpg" alt="chris standing up
holding his daughter elva"> let's fix this, with <picture>!
...the code in responsive.html looks like so: <picture> <source media="(max-width: 799px)" srcset="elva-480w-close-portrait.jpg"> <source media="(min-width: 800px)" srcset="elva-800w.jpg"> <img src="elva-800w.jpg" alt="chris standing up
holding his daughter elva"> </picture> the <source> elements include a media attribute that contains a media condition — as with the first srcset example, these conditions are tests that decide which image is shown — the first one that returns true will be displayed.
Profiling with the Firefox Profiler
tip: you can quickly go deeper into the call tree by
holding down your right arrow key.
... alternatively, expand an entire tree segment by
holding alt and clicking on the arrow to the left of the collapsed tree segment.
browser.altClickSave
the preference browser.altclicksave controls whether clicking a link while
holding the alt key starts the download of that link.
... type:boolean default value: false exists by default: yes application support:firefox 13.0 status: active; last updated 2012-03-19 introduction: pushed to nightly on 2012-03-02 bugs: bug 713052 values true clicking a link while
holding the alt key starts the download of that link.
NSPR Error Handling
pr_proc_desc_table_full_error the process' table for
holding open file descriptors is full.
... pr_sys_desc_table_full_error the system's table for
holding open file descriptors has been exceeded.
Invariants
locks "are we
holding the runtime-wide gc lock?" is a static yes or no for almost every line of code.
...as implemented for native objects, the locking is not really that fine-grained, but that is a transparent optimization as long as we follow the rules.) a thread
holding a property lock never leaves or suspends the current request.
Tracing JIT
when the monitor decides a target pc is hot, it looks in a hashtable of fragments to see if there is a fragment
holding native code for that target pc.
...a deep bail is special only insofar as it requires flushing the full set of deferred writes in the trace if it occurs (and further, requires that all registers
holding temporary trace operands have flushed to the native stack before execution).
nsICachingChannel
holding a reference to this key does not prevent the cached data from being removed.
...
holding a reference to this token prevents the cached data from being removed.
nsIChannel
when the channel is done, it must not continue
holding references to this object.
... note: this is a strong reference to the owner, so if the owner is also
holding a strong reference to the channel, care must be taken to explicitly drop its reference to the channel.
nsIClipboardDragDropHooks
trans the transferable
holding the list of flavors and the data for each flavor.
...trans the transferable
holding the list of flavors and the data for each flavor.
nsICookieAcceptDialog
hostname 2 value for
holding the hostname object.
... cookiesfromhost 3 value for
holding the cookie from the host.
nsIProfileUnlocker
1.0 66 introduced gecko 1.8 inherits from: nsisupports last changed in gecko 1.8 (firefox 1.5 / thunderbird 1.5 / seamonkey 1.0) method overview void unlock(in unsigned long aseverity); constants constant value description attempt_quit 0 politely ask the process currently
holding the profile's lock to quit.
... force_quit 1 forcibly terminate the process
holding the profile lock.
Reference Manual
when nscap_feature_debug_ptr_types is turned on, instead of
holding its underlying pointer in a variable of type nsisupports*, the nscomptr holds it in a pointer matching the underlying type.
...
holding an owning reference on the nsiweakreference object allows you to get to this other object when you need to, but does not require it to go on living, just for you.
Inputs and input sources - Web APIs
properties of input sources each individual xrinputsource has a set of properties that describe the input's available axes and buttons, which hand the user's
holding it in, and how the input source is used to handle targeting within the 3d space.
... example this sample code shows a set of squeeze event handlers that implement these events to manage picking up and
holding objects from the scene.
Web Locks API - Web APIs
work is done while
holding the lock in an asynchronous task.
... advanced use for more complicated cases, such as
holding the lock for an arbitrary amount of time, the callback can return a promise explicitly resolved by the script: // capture promise control functions: let resolve, reject; const p = new promise((res, rej) => { resolve = res; reject = rej; }); // request the lock: navigator.locks.request('my_resource', lock => { // lock is acquired.
Using templates and slots - Web Components
an> <span slot="description">a placeholder inside a web component that users can fill with their own markup, with the effect of composing different dom trees together.</span> <dl slot="attributes"> <dt>name</dt> <dd>the name of the slot.</dd> </dl> </element-details> <element-details> <span slot="element-name">template</span> <span slot="description">a mechanism for
holding client- side content that is not to be rendered when a page is loaded but may subsequently be instantiated during runtime using javascript.</span> </element-details> about that snippet, notice these points: the snippet has two instances of <element-details> elements which both use the slot attribute to reference the named slots "element-name" and "description" we put in the <elem...
... inside a web component that users can fill with their own markup, with the effect of composing different dom trees together.</span> <dl slot="attributes"> <dt>name</dt> <dd>the name of the slot.</dd> </dl> </element-details> <element-details> <span slot="element-name">template</span> <span slot="description">a mechanism for
holding client- side content that is not to be rendered when a page is loaded but may subsequently be instantiated during runtime using javascript.</span> </element-details> <script> customelements.define('element-details', class extends htmlelement { constructor() { super(); const template = document .getelementbyid('elem...
Miscellaneous - Archive of obsolete content
</div> <script type="text/javascript"> var elm = document.getelementbyid("scrollarea"); elm.addeventlistener("dommousescroll", function scroll(event){ //event.detail is positive for a downward scroll, negative for an upward scroll alert("scrolling " + event.detail + " lines"); }, false); </script> if you do not receive a dommousescroll event while
holding any of the modifier keys (ctrl,shift,alt,meta) you should check the mousewheel.withcontrolkey.action and related preferences.
Tabbed browser - Archive of obsolete content
} } /*end do not edit here*/ /*start - do all your edits below here*/ var url = ohttp.uri.spec; //can get url without needing loadcontext if (loadcontext) { var contentwindow = loadcontext.associatedwindow; //this is the html window of the page that just loaded //adomwindow this is the firefox window
holding the tab var adomwindow = contentwindow.top.queryinterface(ci.nsiinterfacerequestor).getinterface(ci.nsiwebnavigation).queryinterface(ci.nsidocshelltreeitem).roottreeitem.queryinterface(ci.nsiinterfacerequestor).getinterface(ci.nsidomwindow); var gbrowser = adomwindow.gbrowser; //this is the gbrowser object of the firefox window this tab is in var at...
Index - Archive of obsolete content
1915 tabbrowser element, mozilla, reference, xul, xul elements, xul reference, tabbrowser this element is used for
holding a set of read-only views of web documents.
Bookmark Keywords - Archive of obsolete content
even better, you can file them for future use by right-clicking (or
holding down the control key and clicking on the link) and filing the bookmarks using the "file bookmark..." option in the contextual menu that pops up.
Index - Archive of obsolete content
1184 tabbrowser element, mozilla, reference, xul, xul elements, xul reference, tabbrowser this element is used for
holding a set of read-only views of web documents.
ContextMenus - Archive of obsolete content
on macintosh systems with only one mouse button, a context menu may be opened by either
holding down the mouse button or by pressing the control key and clicking the mouse button.
OpenClose - Archive of obsolete content
on macintosh systems with only one mouse button, a context menu may be opened by either
holding down the mouse button or by pressing the control key and clicking the mouse button.
Old Proxy API - Archive of obsolete content
fixing a proxy does not alter its object identity (the object “generated” by the handler during fixing does not have its own object identity; it retains the object identity of the proxy, up
holding the illusion that the proxy “becomes” the object).
Reference - Archive of obsolete content
while also
holding in account the previous example where it was avalable in both instances when prototyping object it should be : function->object->instance or (function=object)->instance and ofcourse function == object return false ;) and the following statements also tells me that function == object although math is only an instance of object...
XForms Select Element - Archive of obsolete content
incremental - supported, default value is true properties selection - see corresponding attribute incremental - see corresponding attribute type restrictions the select element can be bound to a node containing simple content capable of
holding a sequence.
Desktop mouse and keyboard controls - Game development
then the pressed key variables are checked and the playerx and playery variables (that we define earlier just after leftpressed and the others)
holding the position of the ship are adjusted by a given amount, let's say 5 pixels.
Unconventional controls - Game development
we will need a few helper variables for our code to work — one for the purpose of calculating the degrees from radians, two for
holding the horizontal and vertical amount of degrees our hand is leaning above the controller, one for the threshold of that lean, and one for the state of our hand's grab status.
Styling links - Learn web development
focused links have an outline around them — you should be able to focus on the links on this page with the keyboard by pressing the tab key (on mac, you'll need to use option + tab, or enable the full keyboard access: all controls option by pressing ctrl + f7.) active links are red (try
holding down the mouse button on the link as you click it.) interestingly enough, these default styles are nearly the same as they were back in the early days of browsers in the mid-1990s.
Reviewer Checklist
resource leaks in java, memory leaks are largely due to singletons
holding on to caches and collections, or observers sticking around, or runnables sitting in a queue.
JNI.jsm
avalsarray a javascript array
holding the values to set.
Promise
{{private:handlers}}: array of objects
holding references to functions registered by the then() method, for pending promises only.
PromiseWorker.jsm
aclosure optional an object
holding strong references to value that should not be garbage-collected before the reply has been received.
Application Translation with Mercurial
the page which opens has a bar
holding information about how many texts (strings) have already been translated, how many there are in english and your locale and have the same text, and how many are missing in your local.
Localization formats
then, an en-us repository was created
holding the translations to all the entity-like values of msgid.
DMD
this can be used to investigate leaks by figuring out which objects might be
holding references to other objects.
JS::PerfMeasurement
perfmeasurement::~perfmeasurement() take care not to leak profiling objects, as they may be
holding down expensive os-level state.
Preference reference
accessibility.tabfocusthe preference accessibility.tabfocus controls what elements receive focus when the user presses the tab key.browser.altclicksavethe preference browser.altclicksave controls whether clicking a link while
holding the alt key starts the download of that link.browser.dom.window.dump.enabledthis setting enables the dump function, which sends messages to the system console.
Introduction to NSPR
the expression may be false only when a thread is in the monitor (
holding the monitor's mutex).
PR_CEnterMonitor
if a match is found, then either the calling thread is already in the monitor (and this is a reentrant call) or another thread is
holding the monitor's mutex.
PR_IntervalNow
pr_intervalnow() is both very efficient and nonblocking, so it is appropriate to use (for example) while
holding a mutex.
PR_Lock
description when pr_lock returns, the calling thread is "in the monitor," also called "
holding the monitor's lock." any thread that attempts to acquire the same lock blocks until the holder of the lock exits the monitor.
PR_TransmitFile
headers a pointer to the buffer
holding the headers to be sent before sending data.
PR_Write
buf a pointer to the buffer
holding the data to be written.
NSS 3.18.1 release notes
cn=mcs
holding test, o=mcs
holding, c=eg sha1 fingerprint: e1:f3:59:1e:76:98:65:c4:e4:47:ac:c3:7e:af:c9:e2:bf:e4:c5:76 the version number of the updated root ca list has been set to 2.4 bugs fixed in nss 3.18.1 this bugzilla query returns all the bugs fixed in nss 3.18.1: https://bugzilla.mozilla.org/buglist.cgi?resolution=fixed&classification=components&query_format=advanced&product...
Index
the samevalue algorithm is equivalent to the following javascript: 441 js_saveexceptionstate jsapi reference, spidermonkey saves the current exception state (that is, any pending exception, or a cleared exception state) associated with the specified context cx, and returns a jsexceptionstate object
holding this state.
Bytecodes
there are also some slots reserved for dedicated functionality,
holding values like this and the callee / return value.
JSObjectOps.defaultValue
on success, *vp must be a primitive value: per es5 §8.12.8, every object "must ensure that its [[defaultvalue]] internal method can return only primitive values." debug builds of spidermonkey will assert if a convert callback is successful but leaves *vp
holding a primitive value.
JS_PushArguments
format const char * null-terminated string
holding a list of format types to convert the following arguments to.
JS_SaveExceptionState
description saves the current exception state (that is, any pending exception, or a cleared exception state) associated with the specified context cx, and returns a jsexceptionstate object
holding this state.
Property attributes
added in spidermonkey 38 mxr id search for jsprop_define_late jsfun_stub_gsops use js_propertystub getter/setter instead of defaulting to class gsops for property
holding function.
mozIStorageAggregateFunction
void onstep( in mozistoragevaluearray afunctionarguments ); parameters afunctionarguments a mozistoragevaluearray
holding the arguments passed in to the function.
mozIStorageFunction
nsivariant onfunctioncall( in mozistoragevaluearray afunctionarguments ); parameters afunctionarguments a mozistoragevaluearray
holding the arguments passed in to the function.
nsIDirIndex
netwerk/streamconv/public/nsidirindex.idlscriptable a class
holding information about a directory index.
nsIFTPEventSink
msg a string
holding response of the last command which had been sent.
nsIFile
this is solved by
holding "private", native data in the nsifile implementation.
Component; nsIPrefBranch
for example
holding the "root" prefbranch and calling addobserver("foo.bar.", ...) will observe changes to foo.bar.baz and foo.bar.bzip.
nsIPrefBranch2
for example
holding the "root" prefbranch and calling addobserver("foo.bar.", ...) will observe changes to foo.bar.baz and foo.bar.bzip.
nsIRadioInterfaceLayer
speakerenabled bool constants call state constants constant value description call_state_unknown 0 call_state_dialing 1 call_state_alerting 2 call_state_busy 3 call_state_connecting 4 call_state_connected 5 call_state_
holding 6 call_state_held 7 call_state_resuming 8 call_state_disconnecting 9 call_state_disconnected 10 call_state_incoming 11 datacall_state_unknown 0 datacall_state_connecting 1 datacall_state_connected 2 datacall_state_disconnecting 3 datacall_state_disconnected 4 call_state_ringing 2 obsolete since gecko 14.0 methods answercall() void answercall( in un...
Getting Started Guide
that is, the interface keeps a count of the number of clients
holding references to it.
Using the clipboard
the first is the flavor we are setting, the second is the object
holding the string, and the third is the length of the data, in bytes.
Streams - Plugins
the buf parameter is a pointer to the buffer
holding the data to write to the stream.
Debugger.Frame - Firefox Developer Tools
handler methods of debugger.frame instances each debugger.frame instance inherits accessor properties
holding handler functions for spidermonkey to call when given events occur in the frame.
Measure a portion of the page - Firefox Developer Tools
when you stop
holding the mouse down, the rectangle that was displayed on screen when you released the button will stay there until you click again, allowing you time to take screenshots, note the information down, etc.
Dominators - Firefox Developer Tools
so when an object becomes unreachable (for example, because it is only referenced by a single local variable which goes out of scope) then any objects it references also become unreachable, as long as no other objects reference them: conversely, this means that objects are kept alive as long as some other reachable object is
holding a reference to them.
Inspect and select colors - Firefox Developer Tools
the color picker includes an eyedropper icon: clicking this icon enables you to use the eyedropper to select a new color for the element from the page: clicking the color sample while
holding down the shift key changes the color format: ...
readValue() - Web APIs
the bluetoothremotegattdescriptor.readvalue() method returns a promise that resolves to an arraybuffer
holding a duplicate of the value property if it is available and supported.
BluetoothRemoteGATTDescriptor - Web APIs
methods bluetoothremotegattdescriptor.readvalue() returns a promise that resolves to an arraybuffer
holding a duplicate of the value property if it is available and supported.
DirectoryReaderSync - Web APIs
self.requestfilesystemsync = self.webkitrequestfilesystemsync || self.requestfilesystemsync; // global for
holding the list of entry file system urls.
Element.setCapture() - Web APIs
example in this example, the current mouse coordinates are drawn while you mouse around after clicking and
holding down on an element.
Using the Gamepad API - Web APIs
we can do much more with the gamepad object, including
holding a reference to it and querying it to find out which buttons and axes are being pressed at any one time.
HTMLFormElement - Web APIs
htmlformelement.elements read only a htmlformcontrolscollection
holding all form controls belonging to this form element.
HTMLOutputElement - Web APIs
htmloutputelement.checkvalidity() checks the validity of the element and returns a boolean
holding the check result.
KeyboardEvent.altKey - Web APIs
key return value boolean examples <html> <head> <title>altkey example</title> <script type="text/javascript"> function showchar(e){ alert( "key keydown: " + string.fromcharcode(e.charcode) + "\n" + "charcode: " + e.charcode + "\n" + "alt key keydown: " + e.altkey + "\n" ); } </script> </head> <body onkeydown="showchar(event);"> <p> press any character key, with or without
holding down the alt key.<br /> you can also use the shift key together with the alt key.
KeyboardEvent.ctrlKey - Web APIs
syntax var ctrlkeypressed = instanceofkeyboardevent.ctrlkey return value a boolean example <html> <head> <title>ctrlkey example</title> <script type="text/javascript"> function showchar(e){ alert( "key pressed: " + e.key + "\n" + "ctrl key pressed: " + e.ctrlkey + "\n" ); } </script> </head> <body onkeypress="showchar(event);"> <p>press any character key, with or without
holding down the ctrl key.<br /> you can also use the shift key together with the ctrl key.</p> </body> </html> specifications specification status comment document object model (dom) level 3 events specificationthe definition of 'keyboardevent.ctrlkey' in that specification.
KeyboardEvent.shiftKey - Web APIs
d> <title>shiftkey example</title> <script type="text/javascript"> function showchar(e){ alert( "key pressed: " + string.fromcharcode(e.charcode) + "\n" + "charcode: " + e.charcode + "\n" + "shift key pressed: " + e.shiftkey + "\n" + "alt key pressed: " + e.altkey + "\n" ); } </script> </head> <body onkeypress="showchar(event);"> <p>press any character key, with or without
holding down the shift key.<br /> you can also use the shift key together with the alt key.</p> </body> </html> specifications specification status comment document object model (dom) level 3 events specificationthe definition of 'keyboardevent.shiftkey' in that specification.
LockManager.request() - Web APIs
return; } // the lock was granted, and no other running code in this origin is
holding // the 'my_res_lock' lock until this returns.
Selection.focusNode - Web APIs
this can be visualized by
holding the shift key and pressing the arrow keys on your keyboard to modify the current selection.
XRInputSource.gripSpace - Web APIs
for example, if a user were
holding a virtual straight rod, the native origin of this xrspace would be located at the approximate center of mass of the user's fist.
XRSession.onsqueezeend - Web APIs
that's because (in this example, at least) the handler for the squeeze event has already dropped the object into its new location and then cleared the value of heldobject to indicate that the user is no longer
holding anything.
Event reference
riptexecute beforescriptexecute menu events dommenuitemactive dommenuiteminactive window events close popup events popuphidden popuphiding popupshowing popupshown tab events visibilitychange battery events chargingchange chargingtimechange dischargingtimechange levelchange call events alerting busy callschanged cfstatechange connecting dialing disconnected disconnecting error held,
holding incoming resuming statechange voicechange sensor events compassneedscalibration devicemotion deviceorientation orientationchange smartcard events icccardlockerror iccinfochange smartcard-insert smartcard-remove stkcommand stksessionend cardstatechange sms and ussd events delivered received sent ussdreceived frame events mozbrowserclose mozbrowsercontextmenu mozbrowsererror mozbrowsericonc...
<a>: The Anchor element - HTML: Hypertext Markup Language
using the download attribute to save a <canvas> as a png to save a <canvas> element’s contents as an image, you can create a link with a download attribute and the canvas data as a data: url: example painting app with save link html <p>paint by
holding down the mouse button and moving it.
HTML documentation index - HTML: Hypertext Markup Language
205 <template>: the content template element element, html, html web components, html:flow content, html:metadata content, html:phrasing content, html:script-supporting element, reference, template, web, web components the html content template (<template>) element is a mechanism for
holding html that is not to be rendered immediately when a page is loaded but may be instantiated subsequently during runtime using javascript.
Redirections in HTTP - HTTP
redirect responses have status codes that start with 3, and a location header
holding the url to redirect to.
A re-introduction to JavaScript (JS tutorial) - JavaScript
add(); // nan // you can't perform addition on undefined you can also pass in more arguments than the function is expecting: add(2, 3, 4); // 5 // added the first two; 4 was ignored that may seem a little silly, but functions have access to an additional variable inside their body called arguments, which is an array-like object
holding all of the values passed to the function.
String - JavaScript
description strings are useful for
holding data that can be represented in text form.