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Check for array not empty: any?
...
>> [nil, 1].any?
=> true
>> [nil, nil].any?
=> false
From the documentation:
If the block is not given, Ruby adds
an implicit block of {|obj| obj} (that
is any? will return true if at least
one of the collection members is not
false or nil).
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Recursive Lock (Mutex) vs Non-Recursive Lock (Mutex)
...maphore - no recursion or inheritance, acts as a coherent resource counter from any desired initial count, threads only block where net count against the resource is zero.
Again, this varies somewhat by platform - especially what they call these things, but this should be representative of the con...
What are all the valid self-closing elements in XHTML (as implemented by the major browsers)?
...ut browsers follow it religiously. Read
Understanding HTML, XML and XHTML from WebKit blog:
In fact, the vast majority of supposedly XHTML documents on the internet are served as text/html. Which means they are not XHTML at all, but actually invalid HTML that’s getting by on the error handlin...
How to import existing Git repository into another?
... copying the files with cp and committing the result.
Original source was from github's "Subtree Merge" help article. And another useful link.
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Cartesian product of multiple arrays in JavaScript
...adding flat and flatMap to the language!
Example
This is the exact example from your question:
let output = cartesian([1,2],[10,20],[100,200,300]);
Output
This is the output of that command:
[ [ 1, 10, 100 ],
[ 1, 10, 200 ],
[ 1, 10, 300 ],
[ 1, 20, 100 ],
[ 1, 20, 200 ],
[ 1, 20, 300 ],
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How to find the JVM version from a program?
... Worth noting that the Java 9 will change the returned value from this string.
– AlBlue
Apr 20 '16 at 19:12
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How do I calculate the normal vector of a line segment?
Suppose I have a line segment going from (x1,y1) to (x2,y2). How do I calculate the normal vector perpendicular to the line?
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Showing a Spring transaction in log
...ve JpaTransactionManager and I wanna monitor when a connection is borrowed from pool and when it was release for a specific transaction.
– Ali
Jun 4 '13 at 18:31
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Good scalaz introduction [closed]
...introduction to the library. Seems that scalaz incorporates a lot of ideas from haskell and mathematics. Most articles that I found assume that you already feel comfortable with these concepts.
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How can I index a MATLAB array returned by a function without first assigning it to a local variable
For example, if I want to read the middle value from magic(5) , I can do so like this:
9 Answers
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