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Haskell: Lists, Arrays, Vectors, Sequences
... up performance tends to come from [Char] which the prelude has aliased as String. Char lists are convient, but tend to run on the order of 20 times slower than C strings, so feel free to use Data.Text or the very fast Data.ByteString. I'm sure there are other sequence oriented libraries I'm not t...
Base 64 encode and decode example code
Does anyone know how to decode and encode a string in Base64 using the Base64. I am using the following code, but it's not working.
...
Python date string to date object
How do I convert a string to a date object in python?
7 Answers
7
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Why do std::shared_ptr work
...ed rather than just a function pointer. But for this case there is no such extra data, it would be sufficient just to store a pointer to an instantiation of a template function, with a template parameter that captures the type through which the pointer must be deleted.
[*] logically in the sense th...
Error in finding last used cell in Excel with VBA
...down the worksheet
(you should note the difference between blank and empty string!).
Note that:
If your range contains non-contiguous non-blank cells, then it will also give a wrong result.
If there is only one non-blank cell, but it is not the first one, your code will still give you the correc...
Why Collections.sort uses merge sort instead of quicksort?
...ast stable sort that guarantees O(n log n)
performance and requires O(n) extra space. In its day (it was written
in 1997 by Joshua Bloch), it was a fine choice, but today but we can
do much better.
Since 2003, Python's list sort has used an algorithm known as timsort
(after Tim Peters,...
Non-alphanumeric list order from os.listdir()
...
You can use the builtin sorted function to sort the strings however you want. Based on what you describe,
sorted(os.listdir(whatever_directory))
Alternatively, you can use the .sort method of a list:
lst = os.listdir(whatever_directory)
lst.sort()
I think should do the...
Block Comments in Clojure
...
Double quotes (string literal) allow adding arbitrary text (not only proper S-forms):
(comment "
public class HelloWorld {
public static void main(String[] args) {
System.out.print("Hello, World");
System.out.println()...
What is the reason why “synchronized” is not allowed in Java 8 interface methods?
... am " + this.getClass() + " . parentFinished. now" + nowStr());
}
private String nowStr() {
return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
}
}
public class SonSync1 extends ParentSync {
public void sonStart() {
System.out.println("I am " + this.getClass() + ". sonS...
Named placeholders in string formatting
In Python, when formatting string, I can fill placeholders by name rather than by position, like that:
19 Answers
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