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What is an idempotent operation?
...re than once with the same input parameters. For example, removing an item from a set can be considered an idempotent operation on the set.
In mathematics, an idempotent operation is one where f(f(x)) = f(x). For example, the abs() function is idempotent because abs(abs(x)) = abs(x) for all x.
Th...
RegEx to extract all matches from string using RegExp.exec
I'm trying to parse the following kind of string:
17 Answers
17
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How can we programmatically detect which iOS version is device running on? [duplicate]
...n't handle well minor versions, it's sufficient if you need to recognize 5 from 6, but not 5.0.1 from 5.1.0
– Marek Sebera
Apr 4 '13 at 7:43
3
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Skip rows during csv import pandas
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You can try yourself:
>>> import pandas as pd
>>> from StringIO import StringIO
>>> s = """1, 2
... 3, 4
... 5, 6"""
>>> pd.read_csv(StringIO(s), skiprows=[1], header=None)
0 1
0 1 2
1 5 6
>>> pd.read_csv(StringIO(s), skiprows=1, header=Non...
Hyphen, underscore, or camelCase as word delimiter in URIs?
...r REST APIs is to have a hyphen, not camelcase or underscores.
This comes from Mark Masse's "REST API Design Rulebook" from Oreilly.
In addition, note that Stack Overflow itself uses hyphens in the URL: .../hyphen-underscore-or-camelcase-as-word-delimiter-in-uris
As does WordPress: http://inventw...
String isNullOrEmpty in Java? [duplicate]
....isNotEmpty(str)
StringUtils.isBlank(str) or StringUtils.isNotBlank(str)
from Apache commons-lang.
The difference between empty and blank is : a string consisted of whitespaces only is blank but isn't empty.
I generally prefer using apache-commons if possible, instead of writing my own utility m...
BeanFactory vs ApplicationContext
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An important note from the linked Spring documentation: "Versions of Spring 2.0 and above make heavy use of the BeanPostProcessor extension point (to effect proxying and suchlike), and if you are using just a plain BeanFactory then a fair amou...
Gradient of n colors ranging from color 1 and color 2
...mark on how. The basic goal is generate a palette of n colors that ranges from x color to y color. The solution needs to work in base though. This was a starting point but there's no place to input an n.
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How to remove multiple deleted files in Git repository
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@kelin: from git docs (git-scm.com/docs/git-add): "-u --update Update the index just where it already has an entry matching <pathspec>. This removes as well as modifies index entries to match the working tree, but adds no new ...
In C# check that filename is *possibly* valid (not that it exists) [duplicate]
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You can get a list of invalid characters from Path.GetInvalidPathChars and GetInvalidFileNameChars as discussed in this question.
As noted by jberger, there some other characters which are not included in the response from this method. For much more details of the ...