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Why doesn't Haskell's Prelude.read return a Maybe?
...th readEither: http://hackage.haskell.org/packages/archive/base/latest/doc/html/Text-Read.html#v:readMaybe
Great question! The type of read itself isn't changing anytime soon because that would break lots of things. However, there should be a maybeRead function.
Why isn't there? The answer is "i...
How do PHP sessions work? (not “how are they used?”)
... setcookie( ) function, the session_start( ) function must come before any HTML, including blank lines, on the page. It will look like this:
<?php session_start( );?><html><head>
....... etc
The session_start( ) function generates a random Session Id and stores it in a cookie on ...
Creating an empty Pandas DataFrame, then filling it?
... DataFrame docs here: http://pandas.pydata.org/pandas-docs/stable/dsintro.html
5 Answers
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Quick-and-dirty way to ensure only one instance of a shell script is running at a time
...command B invokes a subshell for command A. Documented at tldp.org/LDP/abs/html/subshells.html. I am still not sure about the timing of invocation of the subshell and command B.
– Dr. Jan-Philip Gehrcke
Aug 1 '13 at 13:58
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C# XML Documentation Website Link
... Actually, with ReSharper and CTRL+SHIFT+F1 an url is clickable and HTML link is compatible, so that's indeed the best option
– Thomas Hagström
May 31 '16 at 11:23
1
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Can I create more than one repository for github pages?
...fferent sites but just want to host them. In your io repo, create an index.html file on your master branch that acts as a table of contents linking to your other sites(subDirectories) index.html files. The username.github.io master branch seems to be the landing page that enables the hosting, so if ...
What is tail call optimization?
... reading this post after reading 2ality.com/2015/06/tail-call-optimization.html
– agm1984
Nov 12 '17 at 21:31
Nice C i...
C++ Build Systems - What to use? [closed]
...er code generation to trigger a re-cmake, etc. See: javaglue.com/javaglue.html#tag:JavaGlue and code.google.com/p/javaglue
– sdw
Jun 18 '13 at 2:28
3
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bash assign default value
...
Please look at http://www.tldp.org/LDP/abs/html/parameter-substitution.html for examples
${parameter-default}, ${parameter:-default}
If parameter not set, use default. After the call, parameter is still not set.
Both forms are almost equivalent. The extra : makes a...
Coding in Other (Spoken) Languages
...non-native language:
http://people.csail.mit.edu/gregs/ll1-discuss-archive-html/msg01171.html
When Yukihiro Matsumoto ("Matz") started developing Ruby, he used english keywords even though he was writing all the documentation in Japanese!. There was no English documentation for Ruby for a couple ye...