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JavaScript isset() equivalent
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Age old thread, but there are new ways to run an equivalent isset().
ESNext (Stage 4 December 2019)
Two new syntax allow us to vastly simplify the use of isset() functionality:
Optional Chaining(?.)
Nullish Coalescing Operator(??)
Pl...
Android Studio vs Eclipse + ADT Plugin? [closed]
...gins that you can use with the IDE. If you're using the Ultimate edition already and don't want to use two IDE's simultaneously, there is no reason to switch over to Android Studio (except bleeding-edge features).
Android Studio does ship with the C/C++ Plugin now, but AFAIK, there is still no supp...
What's the difference between istringstream, ostringstream and stringstream? / Why not use stringstr
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Why open a file for read/write access if you only need to read from it, for example?
What if multiple processes needed to read from the same file?
share
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What is the purpose of backbone.js?
...Underscore utility library
backbone.js code is well documented and a great read. Opened my eyes to a number of JS code techniques.
Cons:
Took me a while to wrap my head around it and figure out how to apply it to my code, but I'm a Javascript newbie.
Here is a set of great tutorials on using B...
Convert string in base64 to image and save on filesystem in Python
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image_output.seek(0) # seek beginning of the image string
# image_output.read() # Do as you wish with it!
In django, you can save it as an uploaded file to save to a model:
from django.core.files.uploadedfile import SimpleUploadedFile
suf = SimpleUploadedFile('uploaded_file.png', image_output....
Wolfram's Rule 34 in XKCD [closed]
...ack. so jumping is an entirely different color.
And of course you have to read bits from memory.
So all in all Wolfram said he could make any program (that means all conceivable programs exhaustivally) out of just 3 "colors".
Stephen Wolfram has done extensive empiric research on these Turing pat...
Generate an integer that is not among four billion given ones
...nd pass to find of which of the possible numbers in that bucket are used already.
If it means more than 32 bits, but still of bounded size: Do as above, ignoring all input numbers that happen to fall outside the (signed or unsigned; your choice) 32-bit range.
If "integer" means mathematical intege...
How do I style a dropdown with only CSS?
...Explorer 9 (and later) and Firefox 34 (and later) is necessary then keep reading...
Solution #2 Truncate the select element to hide the default arrow (demo)
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(Read more here)
Wrap the select element in a div with a fixed width and overflow:hidden.
Then give the select element a width of about 20...
Core dumped, but core file is not in the current directory?
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Read /usr/src/linux/Documentation/sysctl/kernel.txt.
[/proc/sys/kernel/]core_pattern is used to specify a core dumpfile pattern name.
If the first character of the pattern is a '|', the kernel will treat
the rest of the pat...
Difference between “on-heap” and “off-heap”
... Using Unsafe to allocate objects looks like to have significantly better read and write performance over Onheap/DirectByteBuffers/ByteBuffers. ashkrit.blogspot.com/2013/07/…
– Joe C
May 24 '15 at 3:57
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