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What's the difference between HEAD^ and HEAD~ in Git?
... nonlinear: a directed acyclic graph (DAG) or tree. For a commit with only one parent, rev~ and rev^ mean the same thing. The caret selector becomes useful with merge commits because each one is the child of two or more parents — and strains language borrowed from biology.
HEAD^ means the first im...
Does Python optimize tail recursion?
... +1 For being the correct answer but this seems like an incredibly bone-headed design decision. The reasons given seem to boil down to "it's hard to do given how python is interpreted and I don't like it anyway so there!"
– Basic
Sep 4 '14 at 18:36
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What is the difference between the Facade and Adapter Pattern?
I've been reading both definitions and they seem quite the same. Could anyone point out what are their differences?
16 Answ...
Padding characters in printf
...tring2} )) "$pad"
printf '%s\n' "$string2"
string2=${string2:1}
done
Unfortunately, in that technique, the length of the pad string has to be hardcoded to be longer than the longest one you think you'll need, but the padlength can be a variable as shown. However, you can replace the firs...
Best way to handle list.index(might-not-exist) in python?
...n I'm not sure, and I am looking for something equivalent here. Returning None instead of -1 would be fine, but as you commented yourself, str.find() returns -1 so why shouldn't there be list.find() that does the same thing? I'm not buying the "pythonic" argument
– Draemon
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Determine if map contains a value for a key?
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Alan I have to agree with @dynamic on this one, having to define an iterator and then compare it with end is not a natural way of saying that something does not exist. It seems far more straightforward to me to say that a certain element appears at least once in this ...
How to reference the initial commit?
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There is additional problem with your question: there can exist more than one such TAIL root commit (parentless commit) in a repository (even if we discount disconnected branches, such as 'html', 'man' and 'todo' in git.git repository). This is usually result of joining separate projects in one, or...
Best practices for SQL varchar column length [closed]
...L table or add a new varchar column to an existing table, I am wondering one thing: what is the best value for the length .
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Any reason to clean up unused imports in Java, other than reducing clutter?
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One would be that if you remove the class referenced by the import from the classpath, you won't get a silly compiler error that served no purpose. And you won't get false positives when you perform a "where used" search.
An...
How many database indexes is too many?
...ery slow with lots of indexes since they all need to be modified each time one of these operations takes place
Having said that, you can clearly add a lot of pointless indexes to a table that won't do anything. Adding B-Tree indexes to a column with 2 distinct values will be pointless since it doe...