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How do I clear/delete the current line in terminal?
...y
Ctrl+g Cancel the search and restore original line
Ctrl+n Next command from the History
Ctrl+p previous command from the History
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Why does ConcurrentHashMap prevent null keys and values?
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From the author of ConcurrentHashMap himself (Doug Lea):
The main reason that nulls aren't allowed in ConcurrentMaps
(ConcurrentHashMaps, ConcurrentSkipListMaps) is that ambiguities that
may be just barely tolerable i...
img src SVG changing the styles with CSS
...y can write anything on this platform. MDN: "This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped"
– vsync
Sep 15 '18 at 7:05
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Are there disadvantages to using a generic varchar(255) for all text-based fields?
...uestion with MySQL, I'll mention a MySQL-specific tip: as rows are copied from the storage engine layer to the SQL layer, VARCHAR fields are converted to CHAR to gain the advantage of working with fixed-width rows. So the strings in memory become padded out to the maximum length of your declared V...
How is Math.Pow() implemented in .NET Framework?
... a look at the code requires the source code for the CLR. You can get that from the SSCLI20 distribution. It was written around the .NET 2.0 time frame, I've found the low-level implementations, like Math.Pow() to be still largely accurate for later versions of the CLR.
The lookup table is located i...
PHP, get file name without file extension
...eck out pathinfo(), it gives you all the components of your path.
Example from the manual:
$path_parts = pathinfo('/www/htdocs/index.html');
echo $path_parts['dirname'], "\n";
echo $path_parts['basename'], "\n";
echo $path_parts['extension'], "\n";
echo $path_parts['filename'], "\n"; // filename ...
How to split a string into an array of characters in Python?
...s is that it works the same in both Python 2 and Python 3.
Also, starting from Python 3.5 (thanks to the awesome PEP 448) it's now possible to build a list from any iterable by unpacking it to an empty list literal:
>>> [*'abc']
['a', 'b', 'c']
This is neater, and in some cases more eff...
OnItemCLickListener not working in listview
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I just found a solution from here, but by deep clicking.
If any row item of list contains focusable or clickable view then OnItemClickListener won't work.
The row item must have a param like
android:descendantFocusability = "blocksDescendants".
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What does get-task-allow do in Xcode?
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From this thread on ADC:
get-task-allow, when signed into an application, allows other processes (like the debugger) to attach to your app. Distribution profiles require that this value be turned off, while development profi...
jQuery on window resize
... (win.width() >= 1280) { /* ... */ }
});
How do I stop my resize code from executing so often!?
This is the first problem you'll notice when binding to resize. The resize code gets called a LOT when the user is resizing the browser manually, and can feel pretty janky.
To limit how often your ...