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How to map with index in Ruby?
...o you can call map, select, reject etc. on it just like on an array, hash, range etc.
– sepp2k
Jan 15 '11 at 1:45
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What is the source code of the “this” module doing?
...
This is called rot13 encoding:
d = {}
for c in (65, 97):
for i in range(26):
d[chr(i+c)] = chr((i+13) % 26 + c)
Builds the translation table, for both uppercase (this is what 65 is for) and lowercase (this is what 97 is for) chars.
print "".join([d.get(c, c) for c in s])
Prints...
Multiplication on command line terminal
...other higher-order function
pythonp "n=10;functools.reduce(lambda x,y:x*y, range(1,n+1))"
3628800
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How to print a groupby object
... = pd.DataFrame({'A': ['one', 'one', 'two', 'three', 'three', 'one'], 'B': range(6)})
Then simple 1 line code
df.groupby('A').apply(print)
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Add SUM of values of two LISTS into new LIST
...eed zip, numpy or anything else.
Python 2.x and 3.x:
[a[i]+b[i] for i in range(len(a))]
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Strip all non-numeric characters from string in JavaScript
...ters from a string using JavaScript/ECMAScript. Any characters that are in range 0 - 9 should be kept.
10 Answers
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Regular expression for floating point numbers
...ping can get very confusing. If the language you are working with supports raw strings, then you should use those to cut down on the number of backslashes, but not all languages do (most notably: Java). Fortunately, there's an alternative that will work some of the time:
String correctPattern = "[....
Remove the last character in a string in T-SQL?
... this code returns NULL if passed a string that is shorter than the delete range specified for STUFF. Wrap it in an ISNULL to get a different output value for the empty string case.
– Rozwel
May 2 '12 at 14:18
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How fast is D compared to C++?
... -boundscheck=off <sourcefile>
Results
The results (screenshot of raw console output) of each version of the source as follows:
scalar.cpp (original C++):
allocation: 2 ms
random generation: 12 ms
result: 29248300000
time: 2582 ms
C++ sets the standard at 2582 ms.
scalar.d (modifi...
Write a number with two decimal places SQL server
...c(10,2) allows for 10 total digits with 2 places after the decimal point. Range = -99999999.99 to 99999999.99
– George Mastros
Jan 14 '09 at 2:16
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