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When does invoking a member function on a null instance result in undefined behavior?
Consider the following code:
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Should I use Java date and time classes or go with a 3rd party library like Joda Time?
...ast. This is a very rare use case though.
To respond to the oxbow_lakes' idea of effectively building your own small API, here are my views of why this is a bad idea:
It's work. Why do work when it's already been done for you?
A newcomer to your team is much more likely to be familiar with Joda ...
How to get different colored lines for different plots in a single figure?
I am using matplotlib to create the plots. I have to identify each plot with a different color which should be automatically generated by Python.
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How do I set up DNS for an apex domain (no www) pointing to a Heroku app?
...ic solution is to not use them at all. As a fallback measure, some DNS providers offer to setup an HTTP redirect for you. In that case, set it up so that example.com is an HTTP redirect to www.example.com.
Some DNS providers have come forward with custom solutions that allow CNAME-like behavior on ...
What does @@variable mean in Ruby?
...would not be.
[Update]
As Phrogz mentions in the comments, it's a common idiom in Ruby to track class-level data with an instance variable on the class itself. This can be a tricky subject to wrap your mind around, and there is plenty of additional reading on the subject, but think about it as mod...
List comprehension vs map
...hen you explicitly mutate them; they are containers.
And a bonus: numbers, strings, and tuples are even more predictable since they cannot change at all; they are values.
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Change date of git tag (or GitHub Release based on it)
... environment variable GIT_COMMITTER_DATE before this is
# run, we override the default tag date. Note that if you
# specify the variable on a different line, it will apply to
# the current environment. This isn't desired as probably
# don't want your future tags to also have that pas...
Catching error codes in a shell pipe
...end to a 4-part or N-part pipeline.
Simple experimentation with 'set -e' didn't help.
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Method Resolution Order (MRO) in new-style classes?
...ss occurs more than once in the "naive", depth-first approach -- e.g., consider a "diamond inheritance" case:
>>> class A: x = 'a'
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>>> class B(A): pass
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>>> class C(A): x = 'c'
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>>> class D(B, C): pass
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>>> D.x
'a'
here, legacy-style, ...
git stash blunder: git stash pop and ended up with merge conflicts
I did a git stash pop and ended up with merge conflicts. I removed the files from the file system and did a git checkout as shown below, but it thinks the files are still unmerged. I then tried replacing the files and doing a git checkout again and same result. I event tried forcing it with -...