Use the curry function (from Prelude or Data.Tuple) to convert a function that takes tuples to a function that takes two arguments.
curry fst 1 2 -- computes 1
curry snd 1 2 -- computes 2
curry (uncurry f) -- computes the same as f
import Data.Tuple (swap)
curry swap 1 2 -- computes (2, 1...
Use swap (from Data.Tuple) to swap the components of a pair.
import Data.Tuple (swap)
swap (1, 2) -- evaluates to (2, 1)
Or use pattern matching.
case (1, 2) of (x, y) => (y, x) -- evaluates to (2, 1)
A. The syntax is presented above.
The following selector matches all <input> elements in an HTML document that are not disabled and don't have the class .example:
HTML:
<form>
Phone: <input type="tel" class="example">
E-mail: <input type="em...
The :only-child CSS pseudo-class represents any element which is the only child of its parent.
HTML:
<div>
<p>This paragraph is the only child of the div, it will have the color blue</p>
</div>
<div>
<p>This paragraph is one of the two children of the ...
Caffe has a build-in input layer tailored for image classification tasks (i.e., single integer label per input image). This input "Data" layer is built upon an lmdb or leveldb data structure. In order to use "Data" layer one has to construct the data structure with all training d...
A region is a collapsible block of code, that can help with the readability and organisation of your code.
NOTE: StyleCop's rule SA1124 DoNotUseRegions discourages use of regions. They are usually a sign of badly organized code, as C# includes partial classes and other features which make regions o...
By default, LESS will use its own calc() unless told otherwise. So:
@column-count: 2;
.class-example {
width: calc(100% / @column-count);
}
Would compile to this:
.class-example {
width: 50%;
}
While it is our desired width, LESS has used it's own calc() function to calculate ...
RSA can be used to create a message signature. A valid signature can only be generated with access to the private RSA key, validating on the other hand is possible with merely the corresponding public key. So as long as the other side knows your public key they can verify the message to be signed by...
Asymmetric encryption has the advantage that a message can be encrypted without exchanging a secret key with the recipient of the message. The sender merely needs to know the recipients public key, this allows encrypting the message in such a way that only the designated recipient (who has the corre...
strip_tags is a very powerful function if you know how to use it. As a method to prevent cross-site scripting attacks there are better methods, such as character encoding, but stripping tags is useful in some cases.
Basic Example
$string = '<b>Hello,<> please remove the <> tags.&...
The GNU gprof profiler, gprof, allows you to profile your code. To use it, you need to perform the following steps:
Build the application with settings for generating profiling information
Generate profiling information by running the built application
View the generated profiling inf...
std::ostringstream is a class whose objects look like an output stream (that is, you can write to them via operator<<), but actually store the writing results, and provide them in the form of a stream.
Consider the following short code:
#include <sstream>
#include <string> ...
1. Jenkins :
Jenkins is an open source continuous integration tool written in Java. The project was forked from Hudson after a dispute with Oracle.
In a nutshell, Jenkins is the leading open source automation server. Built with Java, it provides hundreds of plugins to support building, testing, de...
If you'd like to quickly test if an ability class is giving the correct permissions, you can initialize an ability in the console or on another context with the rails environment loaded, just pass an user instance to test against:
test_ability = Ability.new(User.first)
test_ability.can?(:show, Pos...
A UserForm is a class module with a designer and a default instance. The designer can be accessed by pressing Shift+F7 while viewing the code-behind, and the code-behind can be accessed by pressing F7 while viewing the designer.
Work with a new instance every time.
Being a class module, a form i...
The QueryClose event is raised whenever a form is about to be closed, whether it's via user action or programmatically. The CloseMode parameter contains a VbQueryClose enum value that indicates how the form was closed:
ConstantDescriptionValuevbFormControlMenuForm is closing in response to user act...
import groovy.json.JsonSlurper;
def jsonSlurper = new JsonSlurper()
File fl = new File('/path/to/fils.json')
// parse(File file) method is available since 2.2.0
def obj = jsonSlurper.parse(fl)
// for versions < 2.2.0 it's possible to use
def old = jsonSlurper.parse(fl.text)
