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What's the point of 'const' in the Haskell Prelude?
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It's useful for passing to higher-order functions when you don't need all their flexibility. For example, the monadic sequence operator >> can be defined in terms of the monadic bind operator as
x >> y = x >>= const y
It's somewhat neater than using a lambda
x >> y =...
How to slice an array in Bash
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There is also a convenient shortcut to get all elements of the array starting with specified index. For example "${A[@]:1}" would be the "tail" of the array, that is the array without its first element.
version=4.7.1
A=( ${version//\./ } )
echo "${A[@]}" # 4 7 1
B...
How to include view/partial specific styling in AngularJS
...with a better solution.
UPDATE 1: Since posting this answer, I have added all of this code to a simple service that I have posted to GitHub. The repo is located here. Feel free to check it out for more info.
UPDATE 2: This answer is great if all you need is a lightweight solution for pulling in s...
How to only get file name with Linux 'find'?
I'm using find to all files in directory, so I get a list of paths. However, I need only file names. i.e. I get ./dir1/dir2/file.txt and I want to get file.txt
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Creating functions in a loop
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167
You're running into a problem with late binding -- each function looks up i as late as possibl...
Creating a daemon in Linux
...where it was started + a newline.
Daemons work in the background and (usually...) don't belong to a TTY that's why you can't use stdout/stderr in the way you probably want.
Usually a syslog daemon (syslogd) is used for logging messages to files (debug, error,...).
Besides that, there are a few re...
putting datepicker() on dynamically created elements - JQuery/JQueryUI
I have dynamically created textboxes, and I want each of them to be able to display a calendar on click. The code I am using is:
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Web API 最佳入门指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...blic class ContactRepository : IContactRepository
{
MongoServer _server = null;
MongoDatabase _database = null;
MongoCollection _contacts = null;
public ContactRepository(string connection)
{
if (string.IsNullOrWhiteSpace(connection))
...
How to execute a MySQL command from a shell script?
... type it in here>
ERROR 1049 (42000): Unknown database 'XXXXXXXX'
Actually, I prefer to store the user and password in ~/.my.cnf so I don't have to put it on the command-line at all:
[client]
user = root
password = XXXXXXXX
Then:
$ mysql -h "server-name" "database-name" < "filename.sql"
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MySQL - length() vs char_length()
...() returns the length of the string measured in characters.
This is especially relevant for Unicode, in which most characters are encoded in two bytes. Or UTF-8, where the number of bytes varies. For example:
select length(_utf8 '€'), char_length(_utf8 '€')
--> 3, 1
As you can see the E...