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by: Don Vaillancourt |
last post by:
What's going on with Javascript.
At the beginning there was the "undefined" value which represented an
object which really didn't exist then came the null keyword. But
yesterday I stumbled across "null" string.
I know that I will get an "undefined" when I try to retrieve something
from the DOM which doesn't exist.
I have used null myself to initialize or reset variables. But in which
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by: Joona I Palaste |
last post by:
We all know that this:
void *p;
if (p=malloc(1)) {
free(p);
p;
}
causes undefined behaviour if malloc() succeeds. But what about this?
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by: ozbear |
last post by:
Someone was asking in another forum how to translate:
if (x && (y1=(y+y1)/2)) /* all integers with defined values */
to another language.
I am at odds with myself as to whether this causes undefined behaviour
in the first place. Does the subexpression (y1=(y+y1)/2)
cause UB because /y/ is both modified and used without an
intervening sequence point attached to the larger expression
or is it ok because the value of the assignment is...
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by: Pavils Jurjans |
last post by:
Hello,
I am building custom hashtable class, and thinking about value retrieval
issues. The thing is, that sometimes the hashtable value may contain value
null. If someone is reading this value like this
value = myHashtable;
then, is the value of "myKey" key is null, then the result is the same, as
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by: Steven Prasil |
last post by:
I have a C# program with an if statement similar to
if (obj.myvar != Undefined.Value) { ...... }
When I test it in the CSharp CLR debugger this debugger does not recoginze
that the value is currently <undefined value> as shown in the watch list of the Debugger.
Hence the program branches into the if statement although it should skip it
obviously. Why?
Replacing the if statement above by
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by: matty |
last post by:
Hi,
I recently got very confused (well that's my life) about the
"undefined" value. I looked in the FAQ and didn't see anything about
it. On http://www.webreference.com/programming/javascript/gr/column9/
they say:
<snip>
The undefined property
A relatively recent addition to JavaScript is the undefined property.
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by: yb |
last post by:
Hi,
Looking for clarification of undefined variables vs. error in
JavaScript code.
e.g.
<script>
alert( z ); // this will be an error, i.e. an exception
</script>
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by: VK |
last post by:
(see the post by ASM in the original thread; can be seen at
<http://groups.google.com/group/comp.lang.javascript/browse_frm/thread/3716384d8bfa1b0b>
as an option)
As that is not in relevance to "new Array() vs " question or to the
array performance, I dared to move it to a new thread.
Gecko takes undefined value strictly as per Book 4, Chapter 3, Song 9
of Books of ECMA
:-)
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by: -Lost |
last post by:
You can test for an undefined value in two ways:
function blah(x)
{
if (x == undefined) { x = 'default value'; }
}
That could also have been written:
function blah(x)
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by: blargg |
last post by:
Does ~0 yield undefined behavior? C++03 section 5 paragraph 5 seems to
suggest so:
The description of unary ~ (C++03 section 5.3.1 paragraph 8):
But perhaps "one's complement" means the value that type would have with
all bits inverted, rather than the mathematical result of inverting all
bits in the binary representation. For example, on a machine with 32-bit
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
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by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
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by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
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by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
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by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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