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How can I use pointers in Java?
...can be created with pointers and that this can be done by the few who are experts in java. Is it true?
14 Answers
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Extracting bits with a single multiplication
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Very interesting question, and clever trick.
Let's look at a simple example of getting a single byte manipulated. Using unsigned 8 bit for simplicity. Imagine your number is xxaxxbxx and you want ab000000.
The solution consisted of two steps: a bit masking, followed by multiplication. The bit...
In Python, what is the difference between “.append()” and “+= []”?
... import dis
>>> dis.dis(compile("s = []; s.append('spam')", '', 'exec'))
1 0 BUILD_LIST 0
3 STORE_NAME 0 (s)
6 LOAD_NAME 0 (s)
9 LOAD_ATTR 1 (append)
12 LOAD_CONST ...
How to make an immutable object in Python?
...amedtuple internally inside the class instead of instantiating the object externally? I'm very new to python but the advantage to your other answer is that I can have a class hide the details and also have the power of things like optional parameters. If I only look at this answer it seems like I ne...
How to determine a user's IP address in node
...determine the IP address of a given request from within a controller? For example (in express):
19 Answers
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Sorting Python list based on the length of the string
...n an integer, not a boolean. So your code should instead read as follows:
xs.sort(lambda x,y: cmp(len(x), len(y)))
Note that cmp is a builtin function such that cmp(x, y) returns -1 if x is less than y, 0 if x is equal to y, and 1 if x is greater than y.
Of course, you can instead use the key para...
Convert RGB to RGBA over white
I have a hex color, e.g. #F4F8FB (or rgb(244, 248, 251) ) that I want converted into an as-transparent-as-possible rgba color (when displayed over white). Make sense? I'm looking for an algorithm, or at least idea of an algorithm for how to do so.
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Real mouse position in canvas [duplicate]
..., evt) {
var rect = canvas.getBoundingClientRect();
return {
x: evt.clientX - rect.left,
y: evt.clientY - rect.top
};
}
Just call it from your event with the event and canvas as arguments. It returns an object with x and y for the mouse positions.
As the mouse position you...
How to get number of entries in a Lua table?
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I still shudder at the memory of my experience with Lua, when I first realised that the return value of a basic operator like # is not deterministic.
– Roman Starkov
May 5 '12 at 17:07
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How can I convert String to Int?
I have a TextBoxD1.Text and I want to convert it to an int to store it in a database.
30 Answers
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