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Odd behavior when Java converts int to byte?
...umber scheme the most significant bit specifies the sign of the number. If more bits are needed, the most significant bit ("MSB") is simply copied to the new MSB.
So if you have byte 255: 11111111
and you want to represent it as an int (32 bits) you simply copy the 1 to the left 24 times.
Now, one...
How do I create multiple submit buttons for the same form in Rails?
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Changing the form action attribute on the fly is a more brittle solution. Using the commit attribute is less so. You could as an alternative wrap the second submit button inside a different form and pass a parameter that needs to be changed to the same action. But it is not m...
Merge PDF files
... documents page by page,
* merging documents page by page,
(and much more)
Here's a sample program that works with both versions.
#!/usr/bin/env python
import sys
try:
from PyPDF2 import PdfFileReader, PdfFileWriter
except ImportError:
from pyPdf import PdfFileReader, PdfFileWriter
...
Understanding how recursive functions work
... I'm not too happy with thinking of it as a copy. I find that a more intuitive explanation is to differentiate the function itself (the code, what it does) and a function invocation (instantiation of that function) to which a stack frame/execution context is associated. The function doesn...
How do you test that a Python function throws an exception?
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What's the -practical- difference between a Bare and non-Bare repository?
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Download a file from NodeJS Server using Express
...r is concerned, the file's name is just 'download', so you need to give it more info by using another HTTP header.
res.setHeader('Content-disposition', 'attachment; filename=dramaticpenguin.MOV');
You may also want to send a mime-type such as this:
res.setHeader('Content-type', 'video/quicktime'...
Simple basic explanation of a Distributed Hash Table (DHT)
...ee O(log n)-hop routing, and some claim to O(1)-hop routing at the cost of more maintenance.
Read the wikipedia page, and if you really want to know in a bit of depth, check out this coursepage at Harvard which has a pretty comprehensive reading list.
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How to find the php.ini file used by the command line?
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Specify sudo password for Ansible
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