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Difference between this and self in self-type annotations?
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All three forms are valid, and have the effect that B is assumed as the type of this in class A.
The first two variants
trait A { self: B => ... }
trait A { foo: B => ... }
introduce self (respectively, foo) as an alias for t...
Add column with number of days between dates in DataFrame pandas
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Note: ensure you're using a new of pandas (e.g. 0.13.1), this may not work in older versions.
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What is the logic behind the “using” keyword in C++?
What is the logic behind the "using" keyword in C++?
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How to resolve “must be an instance of string, string given” prior to PHP 7?
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Prior to PHP 7 type hinting can only be used to force the types of objects and arrays. Scalar types are not type-hintable. In this case an object of the class string is expected, but you're giving it a (scalar) string. The error...
Why doesn't java.lang.Number implement Comparable? [duplicate]
....lang.Number does not implement Comparable ? This means that you cannot sort Number s with Collections.sort which seems to me a little strange.
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Using SignalR with Redis messagebus failover using BookSleeve's ConnectionUtils.Connect()
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The SignalR team has now implemented support for a custom connection factory with StackExchange.Redis, the successor to BookSleeve, which supports redundant Redis connections via ConnectionMultiplexer.
The initial problem encountered was that in spite of creating m...
How to print a number with commas as thousands separators in JavaScript
...trying to print an integer in JavaScript with commas as thousands separators. For example, I want to show the number 1234567 as "1,234,567". How would I go about doing this?
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PHP script - detect whether running under linux or Windows?
I have a PHP script that may be placed on a windows system or a linux system. I need to run different commands in either case.
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How to preventDefault on anchor tags?
Let's say I have an anchor tag such as
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How do I check if a list is empty?
For example, if passed the following:
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