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Why can Java Collections not directly store Primitives types?
...me consider a mistake. Containers want Objects and primitives don't derive from Object.
This is one place that .NET designers learned from the JVM and implemented value types and generics such that boxing is eliminated in many cases. In CLR, generic containers can store value types as part of the u...
Assigning code to a variable
...nClick(OnButtonClick);
ButtonClicked(); // Execute the function.
}
From here, we can move to lambda expressions and see how they could be useful in your situation:
There are many delegates already defined by .NET libraries, with some like Action, which do not accept any parameter and does no...
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...
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...
Is GridFS fast and reliable enough for production?
...le. It doesn't matter if the image is lost since we will download it again from the merchants website. Pragmatically, we could consider that our server is a simple image cache server.
– Manu Eidenberger
May 12 '11 at 21:17
...
How to check an Android device is HDPI screen or MDPI screen?
...
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...
Why is my Android emulator keyboard in Chinese character mode?
... keyboard.
Note you can also disable the Japanese and other input methods from being activated entirely via Settings → Keyboard → untick the box next to each IME.
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How to use putExtra() and getExtra() for string data
...ble, say str, which stores some string data. Now, I want to send this data from one activity to another activity.
18 Answe...
Adjust width of input field to its input
... {
if (e.which && e.charCode) {
var c = String.fromCharCode(e.keyCode | e.charCode);
var $this = $(this);
resizeForText.call($this, $this.val() + c);
}
});
// Backspace event only fires for keyup
$inputs.find('input').keyup(fun...
Logging raw HTTP request/response in ASP.NET MVC & IIS7
...me too. Didn't even need to be in a handler. I was able to still access it from the page.
– Helephant
May 9 '11 at 12:12
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