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Checking if an object is null in C#
I would like to prevent further processing on an object if it is null.
17 Answers
17
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Incrementing a date in JavaScript
...Script's Date object (no libraries):
My previous answer for #1 was wrong (it added 24 hours, failing to account for transitions to and from daylight saving time; Clever Human pointed out that it would fail with November 7, 2010 in the Eastern timezone). Instead, Jigar's answer is the correct way to...
cv2.imshow command doesn't work properly in opencv-python
...on 2.7
The following simple code created a window of the correct name, but its content is just blank and doesn't show the image:
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Python decorators in classes
Can one write something like:
11 Answers
11
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Reading and writing binary file
I'm trying to write code to read a binary file into a buffer, then write the buffer to another file. I have the following code, but the buffer only stores a couple of ASCII characters from the first line in the file and nothing else.
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How do you convert a byte array to a hexadecimal string, and vice versa?
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Either:
public static string ByteArrayToString(byte[] ba)
{
StringBuilder hex = new StringBuilder(ba.Length * 2);
foreach (byte b in ba)
hex.AppendFormat("{0:x2}", b);
return hex.ToString();
}
or:
public static s...
parseInt(null, 24) === 23… wait, what?
Alright, so I was messing around with parseInt to see how it handles values not yet initialized and I stumbled upon this gem. The below happens for any radix 24 or above.
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Placeholder in UITextView
My application uses an UITextView . Now I want the UITextView to have a placeholder similar to the one you can set for an UITextField .
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Unable to import a module that is definitely installed
After installing mechanize , I don't seem to be able to import it.
32 Answers
32
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Regular expression to match a line that doesn't contain a word
I know it's possible to match a word and then reverse the matches using other tools (e.g. grep -v ). However, is it possible to match lines that do not contain a specific word, e.g. hede , using a regular expression?
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