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Check if a string is null or empty in XSLT
...] null or empty" as inferred from the question, including it's pseudo-code and my own early experience with XSLT. I.e., "What is the equivalent of the following Java?":
!(categoryName == null || categoryName.equals(""))
For more details e.g., distinctly identifying null vs. empty, see johnvey's a...
How do I get bit-by-bit data from an integer value in C?
...( 1 << k )) >> k
Here we create a mask, apply the mask to n, and then right shift the masked value to get just the bit we want. We could write it out more fully as:
int mask = 1 << k;
int masked_n = n & mask;
int thebit = masked_n >> k;
You can read more...
Get the current first responder without using a private API
I submitted my app a little over a week ago and got the dreaded rejection email today. It tells me that my app cannot be accepted because I'm using a non-public API; specifically, it says,
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Parse JSON in JavaScript? [duplicate]
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The standard way to parse JSON in JavaScript is JSON.parse()
The JSON API was introduced with ES5 (2011) and has since been implemented in >99% of browsers by market share, and Node.js. Its usage is simple:
const json = '{ "fr...
Why does .NET use banker's rounding as default?
...s performed, you will average out that all .5's end up rounding equally up and down. This gives better estimations of actual results if you are for instance, adding a bunch of rounded numbers. I would say that even though it isn't what some may expect, it's probably the more correct thing to do.
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BroadcastReceiver with multiple filters or multiple BroadcastReceivers?
I have an Android Activity that needs to catch two different broadcasts. My current approach is to have a single BroadcastReceiver within the Activity and catch both the broadcasts with it:
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printf with std::string?
My understanding is that string is a member of the std namespace, so why does the following occur?
7 Answers
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Convert date to another timezone in JavaScript
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I changed answer to this, since this is correct and standard method without using any library.
– Rizky Ramadhan
Jan 18 '19 at 15:18
5
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How to remove files from git staging area?
I made changes to some of my files in my local repo, and then I did git add -A which I think added too many files to the staging area. How can I delete all the files from the staging area?
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UITableView backgroundColor always gray on iPad
...the backgroundColor for my UITableView it works fine on iPhone (device and simulator) but NOT on the iPad simulator. Instead I get a light gray background for any color I set including groupTableViewBackgroundColor .
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