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JavaScript checking for null vs. undefined and difference between == and ===
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How do I check a variable if it's null or undefined...
Is the variable null:
if (a === null)
// or
if (a == null) // but see note below
...but note the latter will also be true if a is undefined.
Is it undefined:
if (typeof a === "undefined")
// or
if (a ==...
Releasing memory in Python
I have a few related questions regarding memory usage in the following example.
4 Answers
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In C#, should I use string.Empty or String.Empty or “” to intitialize a string?
...rue - due to string interning, it will be created either once per assembly or once per AppDomain (or possibly once for the whole process - not sure on that front). This difference is negligible - massively, massively insignificant.
Which you find more readable is a different matter, however. It's s...
Could not load file or assembly 'Newtonsoft.Json' or one of its dependencies. Manifest definition do
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Just running the reinstall command worked for me. I didn't need to modify web.config.
– Keith
Aug 10 '15 at 15:59
4
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Is Java a Compiled or an Interpreted programming language ?
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compiled just-in-time and executed
interpreted
directly executed by a supported processor (bytecode is the native instruction set of some CPUs)
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What is a web service endpoint?
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This is a shorter and hopefully clearer answer...
Yes, the endpoint is the URL where your service can be accessed by a client application. The same web service can have multiple endpoints, for example in order to make it available using ...
How does the getView() method work when creating your own custom adapter?
...ews, when a View is scrolled so that is no longer visible, it can be used for one of the new Views appearing. This reused View is the convertView. If this is null it means that there is no recycled View and we have to create a new one, otherwise we should use it to avoid creating a new.
3: The pare...
How do you organize your version control repository?
First, I know about this: How would you organize a Subversion repository for in house software projects?
Next, the actual question:
My team is restructuring our repository and I'm looking for hints on how to organize it. (SVN in this case).
Here's what we came up with. We have one repository, mult...
CSS: How do I auto-resize an image to fit a 'div' container?
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Do not apply an explicit width or height to the image tag. Instead, give it:
max-width:100%;
max-height:100%;
Also, height: auto; if you want to specify a width only.
Example: http://jsfiddle.net/xwrvxser/1/
img {
max-width: 100%;
max-he...
Checking if a double (or float) is NaN in C++
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According to the IEEE standard, NaN values have the odd property that comparisons involving them are always false. That is, for a float f, f != f will be true only if f is NaN.
Note that, as some comments below have pointed ou...