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Why does ~True result in -2?
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int(True) is 1.
1 is:
00000001
and ~1 is:
11111110
Which is -2 in Two's complement1
1 Flip all the bits, add 1 to the resulting number and interpret the result as a binary representation of the magnitude and add a negative sign (s...
Storing R.drawable IDs in XML array
...le within your /res/values folder that looks like this:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<integer-array name="random_imgs">
<item>@drawable/car_01</item>
<item>@drawable/balloon_random_02</item>
<item>@dr...
How do I parse JSON with Objective-C?
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175
With the perspective of the OS X v10.7 and iOS 5 launches, probably the first thing to recomme...
How to get the name of the calling method?
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213
puts caller[0]
or perhaps...
puts caller[0][/`.*'/][1..-2]
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How do I kill background processes / jobs when my shell script exits?
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13 Answers
13
Active
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.toArray(new MyClass[0]) or .toArray(new MyClass[myList.size()])?
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114
Counterintuitively, the fastest version, on Hotspot 8, is:
MyClass[] arr = myList.toArray(new...
Selecting a row of pandas series/dataframe by integer index
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echoing @HYRY, see the new docs in 0.11
http://pandas.pydata.org/pandas-docs/stable/indexing.html
Here we have new operators, .iloc to explicity support only integer indexing, and .loc to explicity support only label indexing
e.g. imagine this scenario
In [1...
SQL keys, MUL vs PRI vs UNI
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164
It means that the field is (part of) a non-unique index. You can issue
show create table <...
Multiple queries executed in java in single statement
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140
I was wondering if it is possible to execute something like this using JDBC.
"SELECT FROM * T...