Tutorial by Examples: on

To add a child view controller: - (void)displayContentController:(UIViewController *)vc { [self addChildViewController:vc]; vc.view.frame = self.view.frame; [self.view addSubview:vc.view]; [vc didMoveToParentViewController:self]; } To remove a child view controller: - (void)hid...

trigger ContactTrigger on Contact (before insert, after insert, before update, after update, before delete, after delete, after undelete) { /** Before or After trigger execution**/ /...

To ensure that all possible items are documented, you can use the missing_docs link to receive warnings/errors from the compiler. To receive warnings library-wide, place this attribute in your lib.rs file: #![warn(missing_docs)] You can also receive errors for missing documentation with this lin...

Rust provides two types of documentation comments: inner documentation comments and outer documentation comments. Examples of each are provided below. Inner Documentation Comments mod foo { //! Inner documentation comments go *inside* an item (e.g. a module or a //! struct). They use th...

/// In documentation comments, you may use **Markdown**. /// This includes `backticks` for code, *italics* and **bold**. /// You can add headers in your documentation, like this: /// # Notes /// `Foo` is unsuitable for snafucating. Use `Bar` instead. struct Foo { ... } /// It is cons...

Code in documentation comments will automatically be executed by cargo test. These are known as "documentation tests", and help to ensure that your examples work and will not mislead users of your crate. You can import relative from the crate root (as if there were a hidden extern crate ...

When assigning to a single object, a query that returns anything other than a single row will throw a QueryException. try { Account a = [SELECT Id FROM Account WHERE Name = 'Non-existent Account']; } catch (QueryException e) { // List has no rows for assignment to SObject } try { ...

In Ruby, strings can be left-justified, right-justified or centered To left-justify string, use the ljust method. This takes in two parameters, an integer representing the number of characters of the new string and a string, representing the pattern to be filled. If the integer is greater than th...

An array is a data structure that stores values of same data type. In Python, this is the main difference between arrays and lists. While python lists can contain values corresponding to different data types, arrays in python can only contain values corresponding to same data type. In this tutorial...

Intent: Separate the construction of a complex object from its representation so that the same construction process can create different representations Builder pattern is useful when you have few mandatory attributes and many optional attributes to construct a object. To create an object with dif...

Template method pattern is a behavioral design pattern that defines the program skeleton of an algorithm in an operation, defering some steps to subclasses. Structure: Key notes: Template method uses Inheritance The Template method implemented by the base class should not be overridden. In t...

Often you will want to perform asynchronous operations in parallel. There is direct syntax that supports this in the async/await proposal, but since await will wait for a promise, you can wrap multiple promises together in Promise.all to wait for them: // Not in parallel async function getFriend...

Since Java lambdas are closures, they can "capture" the values of variables in the enclosing lexical scope. While not all lambdas capture anything -- simple lambdas like s -> s.length() capture nothing and are called stateless -- capturing lambdas require a temporary object to hold the...

<?php use Symfony\Bundle\FrameworkBundle\Controller\Controller; use Symfony\Component\HttpFoundation\Request; class TestController extends Controller { //Inject Request HTTP Component in your function then able to exploit it public function myFunctionAction(Request $request) {...

If you like to show the dialog without the close button (i.e. the x button in the upper-right corner of the dialog), perhaps because you want to force the user to select one of options or buttons in the dialog itself: 1- Give your dialog a CSS class: $("#selector").dialog({ closeOnE...

Download: To set up WebSphere Liberty, download the latest zip from WASdev.net. Layout: Once you have the zip, extract it to any location on your file system. The basic layout of a Liberty install is the following: wlp/ # WLP_INSTALL_DIR bin/ # location of scrip...

A python array can be extended with more than one value using extend() method. Here is an example : my_array = array('i', [1,2,3,4,5]) my_extnd_array = array('i', [7,8,9,10]) my_array.extend(my_extnd_array) # array('i', [1, 2, 3, 4, 5, 7, 8, 9, 10]) We see that the array my_array was extended...

The reverse() method does what the name says it will do - reverses the array. Here is an example : my_array = array('i', [1,2,3,4,5]) my_array.reverse() # array('i', [5, 4, 3, 2, 1])

This method provides you the array buffer start address in memory and number of elements in array. Here is an example: my_array = array('i', [1,2,3,4,5]) my_array.buffer_info() (33881712, 5)

tostring() converts the array to a string. my_char_array = array('c', ['g','e','e','k']) # array('c', 'geek') print(my_char_array.tostring()) # geek