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Why is Scala's immutable Set not covariant in its type?
...ameter of type A due to the contravariance of functions. Set could potentially be contravariant in A, but this too causes issues when you want to do things like this:
def elements: Iterable[A]
In short, the best solution is to keep things invariant, even for the immutable data structure. You'll...
Python 2.7 getting user input and manipulating as string without quotations
... your own code?
– JFA
Jan 26 '14 at 16:05
1
@JFA: I don't think input() is a useful function, and...
WordPress asking for my FTP credentials to install plugins
I installed a WordPress blog in my local system. But when I try to add plugins from admin it asks for FTP access. What do I need to configure for WordPress to be able to upload without FTP?
...
List comprehension vs map
...ing map() over list comprehension or vice versa? Is either of them generally more efficient or considered generally more pythonic than the other?
...
Using Pairs or 2-tuples in Java [duplicate]
...to design this class further regarding equality, immutability, etc., especially if you plan to use instances as keys for hashing.
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Swift - encode URL
...= "test/test"
let escapedString = originalString.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)
print(escapedString!)
Output:
test%2Ftest
Swift 1
In iOS 7 and above there is stringByAddingPercentEncodingWithAllowedCharacters
var originalString = "test/test"
var escapedString...
Global access to Rake DSL methods is deprecated
...
You can "delete" Rake 0.9.1 by running the following command:
gem uninstall rake -v=0.9.1
If you have multiple versions of the gem installed, you'll be prompted to pick a version.
After 0.9.1 was cleaned out, I ran
bundle update rake
and was finally able to create my database files. I was ...
Log4net rolling daily filename with date in the file name
...
If I recall correctly, it went like this. On startup, log4net would generate the first filename in the rolling sequence. It would detect that that file already exist and would then decide to roll to the second file, but when that one...
Get content uri from file path in android
...l no luck.
– Narendra Singh
Nov 30 '16 at 9:32
1
This is not working on android Pie api 28. Curso...
How can I export tables to Excel from a webpage [closed]
... can I export tables to Excel from a webpage. I want the export to contain all the formatting and colours.
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