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vector vs. list in STL
...ut the end of a sequence repeatedly.
Check out the complexity guarantees for each different type of container:
What are the complexity guarantees of the standard containers?
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Find first element in a sequence that matches a predicate
...To find first element in a sequence seq that matches a predicate:
next(x for x in seq if predicate(x))
Or (itertools.ifilter on Python 2):
next(filter(predicate, seq))
It raises StopIteration if there is none.
To return None if there is no such element:
next((x for x in seq if predicate(x)...
Regex not operator
Is there an NOT operator in Regexes?
Like in that string : "(2001) (asdf) (dasd1123_asd 21.01.2011 zqge)(dzqge) name (20019)"
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Round to 5 (or other number) in Python
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I don't know of a standard function in Python, but this works for me:
Python 2
def myround(x, base=5):
return int(base * round(float(x)/base))
Python3
def myround(x, base=5):
return base * round(x/base)
It is easy to see why the above works. You want to make sure th...
versionCode vs versionName in Android Manifest
...sion number. This number is used only to determine whether one version is more recent than another, with higher numbers indicating more recent versions. This is not the version number shown to users; that number is set by the versionName attribute.
The value must be set as an integer, such as "100...
What are the differences between the BLOB and TEXT datatypes in MySQL?
...the character set they have associated with time. BLOB and BINARY simply store bytes.
BLOB is used for storing binary data while Text is used to store large string.
BLOB values are treated as binary strings (byte strings). They have no character set, and sorting and comparison are based on the num...
Format a number as 2.5K if a thousand or more, otherwise 900
I need to show a currency value in the format of 1K of equal to one thousand, or 1.1K, 1.2K, 1.9K etc, if its not an even thousands, otherwise if under a thousand, display normal 500, 100, 250 etc, using javascript to format the number?
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How to find whether or not a variable is empty in Bash
...ited Oct 30 '19 at 10:57
Peter Mortensen
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answered Jun 17 '10 at 17:09
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Is C++ context-free or context-sensitive?
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Below is my (current) favorite demonstration of why parsing C++ is (probably) Turing-complete, since it shows a program which is syntactically correct if and only if a given integer is prime.
So I assert that C++ is neither context-free nor context-...
Ruby - test for array
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Type checking is for Java. Go ahead and just call count on the variable. Write unit tests to make sure the method works as expected.
– user132447
Mar 21 '12 at 14:55
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