class Functor f where
fmap :: (a -> b) -> f a -> f b
One way of looking at it is that fmap lifts a function of values into a function of values in a context f.
A correct instance of Functor should satisfy the functor laws, though these are not enforced by the compiler:
fmap id = i...
Steps to create "Hello, World!" application in Oracle Application Express:
Log in to your workspace.
Click Application Builder. Application Builder page opens.
Click Create. Page with 4 application types appears. Page contains short help text about each application type.
Click Deskto...
Introduction
C/C++ IDE for ARM development.
Atollic TrueSTUDIO® is tested and verified on the following Operating Systems:
Microsoft® Windows ®Vista (32-bit version)
Microsoft® Windows® Vista (64-bit version)
Microsoft® Windows® 7 (32-bit version)
Microsoft® Windows® 7 (64-bit version)
Micr...
This is a simple RMI example with five Java classes and two packages, server and client.
Server Package
PersonListInterface.java
public interface PersonListInterface extends Remote
{
/**
* This interface is used by both client and server
* @return List of Persons
* @throws...
Lists as arguments are just another variable:
def func(myList):
for item in myList:
print(item)
and can be passed in the function call itself:
func([1,2,3,5,7])
1
2
3
5
7
Or as a variable:
aList = ['a','b','c','d']
func(aList)
a
b
c
d
In addition to libraries defined in EcmaScript language specification and EcmaScript internationalization API specification, d8 also implements the following functions and objects.
print(args...): function. Print to stdout.
printErr(args...): function. Print to stderr.
write(args...): function....
If class A is in relationship with class B and class B has property with the same name and type as the primary key of A, then EF automatically assumes that property is foreign key.
public class Department
{
public int DepartmentId { set; get; }
public string Name { set; get; }
publi...
As we all are aware that PHP writes session data into a file at server side. When a request is made to php script which starts the session via session_start(), PHP locks this session file resulting to block/wait other incoming requests for same session_id to complete, because of which the other requ...
One day I had a conversation with a friend of mine who uses Laravel PHP framework in his job. When I told him that Django has its own all-included HTML CRUD system, for interacting with the database, called Django admin, his eyes popped off! He told me: "It took me months to build an Admin inte...
As an example you want to disable pagination in your default index action and get all results in index.
How can you do that?
It's simple. You should override the index action in your controller like this:
public function actions() {
$actions = parent::actions();
unset($actions['index'])...
Build the APK
First of all we need to build the APK.
ionic build --release android
Generate private Key
Then we will create a keystore to sign the APK.
keytool -genkey -v -keystore my-release-key.keystore -alias alias_name -keyalg RSA -keysize 2048 -validity 10000
Change my-release-key with ...
Save data to and from file
import pickle
def save(filename,object):
file=open(filename,'wb')
pickle.dump(object,file)
file.close()
def load(filename):
file=open(filename,'rb')
object=pickle.load(file)
file.close()
return object
>>>list_object=[1,...
Example Controller action
use Symfony\Component\HttpFoundation\Request;
public function exampleAction(Request $request)
{
/*
* First you need object ready for validation.
* You can create new object or load it from database.
* You need to add some constraints for this obj...
Usually we are not using second parameter in select([$select = '*'[, $escape = NULL]]) in CodeIgniter.
If you set it to FALSE, CodeIgniter will not try to protect your field or table names.
In the following example, we are going to select the datetime type field by formatting it using sql query an...
A function is a unit of code that represents a sequence of statements.
Functions can accept arguments or values and return a single value (or not). To use a function, a function call is used on argument values and the use of the function call itself is replaced with its return value.
Every functio...
