Tutorial by Examples: w

The above example only works if your tasks are entirely standard tasks. You do not add extra context here, for example. Let's make a more realistic example. Assume we want to add a page title to the template. In the functional view, this would work like this - with just one additional line: def cr...

The true power of generic views unfolds when you combine them with Mixins. A mixin is a just another class defined by you whose methods can be inherited by your view class. Assume you want every view to show the additional variable 'page_title' in the template. Instead of overriding the get_context...

The core idea of VLOOKUP is to look up information in a spreadsheet table and place it in another. For example, suppose this is the table in Sheet1: John 12/25/1990 Jane 1/1/2000 In Sheet2, place John, Andy, and Jane in A1, A2, and A3. In B1, to the right of John, I placed: =VL...

HeroChildComponent has two input properties, typically adorned with @Input decorations. import { Component, Input } from '@angular/core'; import { Hero } from './hero'; @Component({ selector: 'hero-child', template: ` <h3>{{hero.name}} says:</h3> <p>I, {{hero.nam...

When creating a model for a table that has a composite primary key, additional work is required on the Object for the model Entity to respect those constraints. The following example SQL table and Entity demonstrates the structure to store a review left by a customer for an item in an online store....

After adding the GreenDao library dependency and Gradle plugin, we need to first create an entity object. Entity An entity is a Plain Old Java Object (POJO) that models some data in the database. GreenDao will use this class to create a table in the SQLite database and automatically generate helpe...

As stated above Functions are smaller procedures that contain small pieces of code which may be repetitive inside a Procedure. Functions are used to reduce redundancy in code. Similar to a Procedure, A function can be declared with or without an arguments list. Function is declared as a return ty...

In Sprite-Kit, there is the concept of collisions which refers to the SK physics engine handling how physics objects interact when they collide i.e. which ones bounce off which other ones. It also has the concept of contacts, which is the mechanism by which your program gets informed when 2 physics...

Gin is a web framework written in Golang. It features a martini-like API with much better performance, up to 40 times faster. If you need performance and good productivity, you will love Gin. There will be 8 packages + main.go controllers core libs middlewares public routers services...

import Foundation enum Breed: String { case bulldog = "Bulldog" case doberman = "Doberman" case labrador = "Labrador" } struct Dog { let name: String let breed: String let age: Int }

import Foundation protocol DoggyView: NSObjectProtocol { func startLoading() func finishLoading() func setDoggies(_ doggies: [DoggyViewData]) func setEmpty() }

import Foundation typealias Result = ([Dog]) -> Void class DoggyService { func deliverDoggies(_ result: @escaping Result) { let firstDoggy = Dog(name: "Alfred", breed: Breed.labrador.rawValue, age: 1) let secondDoggy = Dog(name: "Vinny&quot...

import Foundation class DoggyPresenter { // MARK: - Private fileprivate let dogService: DoggyService weak fileprivate var dogView: DoggyView? init(dogService: DoggyService){ self.dogService = dogService } func attachView(_ attach: Bool, view: DoggyView...

import UIKit class DoggyListViewController: UIViewController, UITableViewDataSource { @IBOutlet weak var emptyView: UIView? @IBOutlet weak var tableView: UITableView? @IBOutlet weak var spinner: UIActivityIndicatorView? fileprivate let dogPresenter = DoggyPresenter(dogSe...

This is a tutorial to create a hello world example: Used for this example: Android Studio 2.3; To Start use Android Studio to create a new Project with an empty activity. Then we add some simple functionality to the App that we can test: We add a button which when clicks displays "Hello World...

Getting set up to use webdev takes some time, if you're doing anything more than tweaking a bit of text. Here are the initial setup steps: $ mkdir site $ cd site $ git clone [email protected]:dart-lang/site-webdev.git $ source ./scripts/env-set.sh $ ./scripts/install-dart-sdk.sh $ ./s...

This code will prompt you to create the directory with :w, or just do it with :w!: augroup vimrc-auto-mkdir autocmd! autocmd BufWritePre * call s:auto_mkdir(expand('<afile>:p:h'), v:cmdbang) function! s:auto_mkdir(dir, force) if !isdirectory(a:dir) \ && (a:f...

In this example, we will try to find JavaScript data which containing backgroundColor:'#FFF'. Then, we will change value of backgroundColor '#FFF' ⇨ '#ddd'. This code uses getWholeData() and setWholeData() methods to manipulate JavaScript data. Alternatively, html() method can be used to get data of...

Mutable global items (called static mut, highlighting the inherent contradiction involved in their use) are unsafe because it is difficult for the compiler to ensure they are used appropriately. However, the introduction of mutually exclusive locks around data allows memory-safe mutable globals. Th...

Processing provides the method triangle in order to draw a triangle. The code below draws a nearly equilateral triangle of 25 pixels between each defining point. void setup() { size(500, 500); background(0); } void draw() { triangle(0, 0, 25, 0, 12, 12); } The signature of tria...