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Difference between abstraction and encapsulation?
What is the precise difference between encapsulation and abstraction?
39 Answers
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Using getopts to process long and short command line options
...er options.
BSD UNIX implementation of standalone getopt command (which is what MacOS uses). This does not support long options either.
GNU implementation of standalone getopt. GNU getopt(3) (used by the command-line getopt(1) on Linux) supports parsing long options.
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How to implement a Map with multiple keys? [duplicate]
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Er, yeah, this is exactly what you proposed. Two Maps is the way to go. To extend to an arbitrary number of keys, have a method like getByKey(MetaKey mk, Object k) and then a Map<MetaKey, Map<Object, V>> internally.
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How to see the changes in a Git commit?
...ee gitrevision "SPECIFYING REVISIONS" to reference a commit-ish.
See also "What does tree-ish mean in Git?".
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How do I show the changes which have been staged?
...ot point to HEAD, just difference with respect to HEAD. If you cherry pick what to commit using git add --patch (or git add -p), --staged will return what is staged.
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git pull fails “unable to resolve reference” “unable to update local ref”
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Why does this work? What is the problem that it fixes?
– Ikke
Feb 14 '17 at 14:22
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Python Sets vs Lists
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It depends on what you are intending to do with it.
Sets are significantly faster when it comes to determining if an object is present in the set (as in x in s), but are slower than lists when it comes to iterating over their contents.
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source command not found in sh shell
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@Milad I think it does not work on ubuntu 14.04. What is your OS version?
– Reza Ameri
Dec 29 '14 at 19:32
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Adding a public key to ~/.ssh/authorized_keys does not log me in automatically
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The restorecon is what you need after you have copied the files by hand, e.g. to a new hard drive. (You should probably run it on all files in this case. Could fix other odd problems.)
– ospalh
Sep 24 '15...
How to get the children of the $(this) selector?
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for what it's worth: jQuery("img", this) is internally converted into: jQuery(this).find("img") So the second is ever so slightly faster. :)
– Paul Irish
Jan 8 '10 at 23:49
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