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What is the purpose of setting a key in data.table?
...ses to list (i.e., they are equivalent). Internally when i is a list, it's converted to a data.table following which binary search is used to compute row indices. Fixed 1e4 to 1e5 to avoid confusion. Thanks for spotting. Note that we can directly use on= argument now to perform binary subsets rather...
Best explanation for languages without null
...find (_.firstName == "joe")) map (fullNameLength)
How does this work?
//convert an Option[List[Person]] to an Option[S]
//where the function f takes a List[Person] and returns an S
people map f
//find a person named "Joe" in a List[Person].
//returns Some[Person], or None if "Joe" isn't in the l...
Regular Expression For Duplicate Words
...t possible to do \0 too? (Where \0 is the whole regex, up to the current point OR where \0 refers to the whole regex)
– Pindatjuh
May 12 '10 at 22:37
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One line if-condition-assignment
...e should not use this approach if looping through large data sets since it introduces an unnecessary assignment in case we end up in the else-statement.
– dapc
Dec 12 '19 at 9:23
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Hidden Features of SQL Server
...of-batch marker to cause the batch to be repeated that number of times:
PRINT 'X'
GO 10
Will print 'X' 10 times. This can save you from tedious copy/pasting when doing repetitive stuff.
share
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How do I mock an autowired @Value field in Spring with Mockito?
...ably won't need it since the method is very easy to use
UPDATE
Since the introduction of Spring 4.2.RC1 it is now possible to set a static field without having to supply an instance of the class. See this part of the documentation and this commit.
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Java Ordered Map
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The SortedMap interface (with the implementation TreeMap) should be your friend.
The interface has the methods:
keySet() which returns a set of the keys in ascending order
values() which returns a collection of all values in the ascendi...
Java ArrayList copy
...ze 10. I assign l1 to new list reference type l2 . Will l1 and l2 point to same ArrayList object? Or is a copy of the ArrayList object assigned to l2 ?
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A potentially dangerous Request.Path value was detected from the client (*)
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I ran into the same scenario where one of my parameters was a URL. Even when properly URL encoded, I would get this error. I finally just base64 encoded the parameter (and decode in my api) which was much easier than trying to fi...
document.getElementById vs jQuery $()
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For anyone interested document.getElementBy doesn't work correctly in <IE8. It also gets elements by name therefore you could theoretically argue document.getElementById is not only misleading, but can return incorrect values. I th...