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Error: The processing instruction target matching “[xX][mM][lL]” is not allowed

...s can happen when XML files are combined programmatically or via cut-and-paste. There can only be one <?xml ?> declaration in an XML file, and it can only be at the top. Resolution: Search for <?xml in a case-insensitive manner, and remove all but the top XML declaration from the...
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What is the fastest or most elegant way to compute a set difference using Javascript arrays?

Let A and B be two sets. I'm looking for really fast or elegant ways to compute the set difference ( A - B or A \B , depending on your preference) between them. The two sets are stored and manipulated as Javascript arrays, as the title says. ...
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What is the most elegant way to remove a path from the $PATH variable in Bash?

... @Martin: POSIX does not require this behavior, but does document and allow it: pubs.opengroup.org/onlinepubs/9699919799/basedefs/… – Fred Foo Mar 13 '11 at 23:04 1 ...
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How to easily initialize a list of Tuples?

... { (1, "cow"), (5, "chickens"), (1, "airplane") }; And if you don't like "Item1" and "Item2", you can do: var tupleList = new List<(int Index, string Name)> { (1, "cow"), (5, "chickens"), (1, "airplane") }; or for an array: var tupleList = ...
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What is the difference between getFields and getDeclaredFields in Java reflection

I'm a little confused about the difference between the getFields method and the getDeclaredFields method when using Java reflection. ...
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How does database indexing work? [closed]

...a section for data, a pointer to the location of the next node (or block), and both need not be stored contiguously. Due to the fact that a number of records can only be sorted on one field, we can state that searching on a field that isn’t sorted requires a Linear Search which requires N/2 block...
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How to change my Git username in terminal?

I was pushing and pulling from git in Terminal then I changed my username on github.com. I went to push some changes and it couldn't push because it was still recognizing my old username.. How do I change/update my username on git in terminal? ...
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What is a git topic branch?

... Topic branches are typically lightweight branches that you create locally and that have a name that is meaningful for you. They are where you might do work for a bug fix or feature (they're also called feature branches) that is expected to take some time to complete. Another type of branch is the ...
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How to map and remove nil values in Ruby

... Ruby 2.7 is introducing filter_map for this exact purpose. It's idiomatic and performant, and I'd expect it to become the norm very soon. For example: numbers = [1, 2, 5, 8, 10, 13] enum.filter_map { |i| i * 2 if i.even? } # => [4, 16, 20] In your case, as the block evaluates to falsey, simp...
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How to go to each directory and execute a command?

...e a bash script that goes through each directory inside a parent_directory and executes a command in each directory . ...