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Transposing a 2D-array in JavaScript
...rix.reduce((prev, next) => next.map((item, i) =>
(prev[i] || []).concat(next[i])
), []);
}
Lodash/Underscore by marcel
function tranpose(matrix) {
return _.zip(...matrix);
}
// Without spread operator.
function transpose(matrix) {
return _.zip.apply(_, [[1,2,3], [1,2,3], [1,2,3]]...
When to use StringBuilder in Java [duplicate]
...is supposed to be generally preferable to use a StringBuilder for string concatenation in Java. Is this always the case?
...
Build and Version Numbering for Java Projects (ant, cvs, hudson)
... <!-- sort the file, ONLY for ant 1.7.0 and newer!!!--> <concat> <union> <sort> <tokens> <file file="${antprops.file}" /> <linetokenizer includedelims="true" /> </tokens> </s...
SSMS插件开发指南 - C/C++ - 清泛网 - 专注C/C++及内核技术
...eInfo = cultureInfo.Parent;
resourceName = String.Concat(parentCultureInfo.Name, "Tools");
}
else
{
resourceName = String.Concat(cultureInfo.TwoLetterISOLanguageName, "Tools");
...
UPDATE multiple tables in MySQL using LEFT JOIN
...eld text in table A with
UPDATE `Table A`,`Table B`
SET `Table A`.`text`=concat_ws('',`Table A`.`text`,`Table B`.`B-num`," from
",`Table B`.`date`,'/')
WHERE `Table A`.`A-num` = `Table B`.`A-num`
and come to this result:
Table A
+--------+------------...
Return multiple columns from pandas apply()
... series, new columns exist):')
df_test = create_new_df_test()
df_test = pd.concat([df_test, pd.DataFrame(columns=['size_kb', 'size_mb', 'size_gb'])])
%timeit result = df_test.apply(sizes_pass_series_return_series, axis=1)
print('\nPandafied (pass series, return tuple, new columns dont exist):')
df_...
How do I concatenate multiple C++ strings on one line?
C# has a syntax feature where you can concatenate many data types together on 1 line.
24 Answers
...
How can I match on an attribute that contains a certain string?
...ssname listed.
The usual approach is the rather unwieldy:
//*[contains(concat(' ', @class, ' '), ' atag ')]
this works as long as classes are separated by spaces only, and not other forms of whitespace. This is almost always the case. If it might not be, you have to make it more unwieldy still...
How to shift a column in Pandas DataFrame
...f[2].index+1
and finally re-combine the single columns
>>> pd.concat([df[1], df[2]], axis=1)
1 2
0 206.0 NaN
1 226.0 214.0
2 245.0 234.0
3 265.0 253.0
4 283.0 272.0
5 NaN 291.0
Perhaps not fast but simple to read. Consider setting variables for the column n...
How do I join two lists in Java?
...
In Java 8:
List<String> newList = Stream.concat(listOne.stream(), listTwo.stream())
.collect(Collectors.toList());
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