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Modulo operator with negative values [duplicate]
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From ISO14882:2011(e) 5.6-4:
The binary / operator yields the quotient, and the binary % operator
yields the remainder from the division of the first expression by the
second. If the second operand of / or % is zero t...
How do sessions work in Express.js with Node.js?
...e like a placeholder for the session than a holder of actual session data.
From here, it looks like this session data on the server is by default held in memory, although that could be altered to whatever storage form implements the appropriate API.
So if you want to check things without a specifi...
How to properly compare two Integers in Java?
...ividual operator's documentation to see whether it's applied. For example, from the docs for == and != (JLS 15.21.1):
If the operands of an equality
operator are both of numeric type, or
one is of numeric type and the other
is convertible (§5.1.8) to numeric
type, binary numeric promoti...
Microsoft Azure: How to create sub directory in a blob container
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how you filter or get all these files from "folder" ?
– afr0
Oct 16 '15 at 0:09
2
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How to check an Android device is HDPI screen or MDPI screen?
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From the above answers, I combined them and created the below function:
public static String getDeviceDensity(Context context){
String deviceDensity = "";
switch (context.getResources().getDisplayMetrics().densit...
Prompt for user input in PowerShell
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Read-Host is a simple option for getting string input from a user.
$name = Read-Host 'What is your username?'
To hide passwords you can use:
$pass = Read-Host 'What is your password?' -AsSecureString
To convert the password to plain text:
[Runtime.InteropServices.Marshal]...
Reorder levels of a factor without changing order of values
... for manipulating factors and I'm finding it outrageously useful. Examples from the OP's data frame:
levels(df$letters)
# [1] "a" "b" "c" "d"
To reverse levels:
library(forcats)
fct_rev(df$letters) %>% levels
# [1] "d" "c" "b" "a"
To add more levels:
fct_expand(df$letters, "e") %>% leve...
How do I append one string to another in Python?
...for i in range(n):
s+=str(i)
used to be O(n^2), but now it is O(n).
From the source (bytesobject.c):
void
PyBytes_ConcatAndDel(register PyObject **pv, register PyObject *w)
{
PyBytes_Concat(pv, w);
Py_XDECREF(w);
}
/* The following function breaks the notion that strings are immuta...
Android: show soft keyboard automatically when focus is on an EditText
...ner on the EditText on the AlertDialog, then get the AlertDialog's Window. From there you can make the soft keyboard show by calling setSoftInputMode.
final AlertDialog dialog = ...;
editText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
@Override
public void onFocusChange(Vi...
Editing screenshots in iTunes Connect after iOS app was approved
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Acutally new version of Developer Guide has an update from Sept 2010: Screenshots are now an unlocked metadata attribute and can be updated at any time
– Fraggle
Jan 20 '11 at 14:49
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