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Difference between reduce and foldLeft/fold in functional programming (particularly Scala and Scala
...c. Thanks to @CafeFeed for pointing out that fold uses runJob, which after reading through the code I realised that it's non-deterministic. Further confusion is created by Spark having a treeReduce but no treeFold.
Conclusion
There is a difference between reduce and fold even when applied to non-e...
Regular expression for matching HH:MM time format
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@SergO please read his answer more carefully. His answer is for both a leading zero and without.
– Alexander
Feb 5 '14 at 21:02
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How can I add a vertical scrollbar to my div automatically?
...y 100px, use max-height instead of height property.
For more information, read this MDN article.
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Iterate through every file in one directory
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This is my favorite method for being easy to read:
Dir.glob("*/*.txt") do |my_text_file|
puts "working on: #{my_text_file}..."
end
And you can even extend this to work on all files in subdirs:
Dir.glob("**/*.txt") do |my_text_file| # note one extra "*"
puts "...
Retrieving the last record in each group - MySQL
...searching for the last request_id for each test_id.
Bill's solution has already been running for several hours on my dell e4310 and I do not know when it is going to finish even though it operates on a coverage index (hence using index in EXPLAIN).
I have a couple of other solutions that are based...
How to parse date string to Date? [duplicate]
...would also reconsider if you wouldn't rather like to use HH instead of kk. Read the javadoc for details about valid patterns.
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Reload an iframe with jQuery
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The advantage of this solution is readability. While not as efficient as Vidas's answer, it's obvious what is happening.
– Robert Egginton
Jul 8 '16 at 21:36
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How does having a dynamic variable affect performance?
I have a question about the performance of dynamic in C#. I've read dynamic makes the compiler run again, but what does it do?
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How to detect pressing Enter on keyboard using jQuery?
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I'm linking to this because I read this and left scratching my head over why keypress didn't work with IE. (it won't bind to $(window) under IE) quirksmode.org/dom/events/keys.html
– Incognito
Mar 2 '11 at 16:49
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How to limit setAccessible to only “legitimate” uses?
..., will just make you lose your hair. In any case they'll probably make you read the Secure Coding Guidelines along with internal documentation.
If you're going to be writing Java applets, the security framework is something you should be aware of. You'll find that unsigned applets trying to call se...