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Get names of all files from a folder with Ruby
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You also have the shortcut option of
Dir["/path/to/search/*"]
and if you want to find all Ruby files in any folder or sub-folder:
Dir["/path/to/search/**/*.rb"]
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Why doesn't Dijkstra's algorithm work for negative weight edges?
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Recall that in Dijkstra's algorithm, once a vertex is marked as "closed" (and out of the open set) - the algorithm found the shortest path to it, and will never have to develop this node again - it assumes the path developed to this path is the shortest.
But with negative weights - it might not be...
Postgres - FATAL: database files are incompatible with server
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If you recently upgraded to 11 or 12 from 10.x you can run the below command to upgrade your postgres data directory retaining all data:
brew postgresql-upgrade-database
The above command is taken from the output of brew info postgres
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Determine function name from within that function (without using traceback)
...ould be implemented or what the precise semantics should be in edge cases, and there aren't enough important use cases given. response has been lukewarm at best.
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Java Can't connect to X11 window server using 'localhost:10.0' as the value of the DISPLAY variable
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This command helped me to solve the problem:
export DISPLAY=:0
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Sourcetree - undo unpushed commits
I am using Sourcetree for Windows for a git-repository and would like to undo an unpushed commit.
4 Answers
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Position Absolute + Scrolling
With the following HTML and CSS
4 Answers
4
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Elegant solution to duplicate, const and non-const, getters? [duplicate]
...e member function calling it is non-const, the object itself is non-const, and casting away the const is allowed.
class Foo
{
public:
const int& get() const
{
//non-trivial work
return foo;
}
int& get()
{
return const_cast<int&>(const_c...
:not(:empty) CSS selector is not working?
...ed by an attribute in the start tag, rather than text content within start and end tags.
Also, from the Selectors spec:
The :empty pseudo-class represents an element that has no children at all. In terms of the document tree, only element nodes and content nodes (such as DOM text nodes, CDATA n...
Difference between an API and SDK
... to explain what a software interface is with an easier to visually understand hardware analogy
– Sliceoftime
May 7 '09 at 14:50
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