Tutorial by Examples: p

Private fields

There are two common conventions for private fields: camelCase and _camelCaseWithLeadingUnderscore. Camel case public class Rational { private readonly int numerator; private readonly int denominator; public Rational(int numerator, int denominator) { // "this&q...

C# Language • Naming Conventions

Apply part of a stash with checkout

You've made a stash and wish to checkout only some of the files in that stash. git checkout stash@{0} -- myfile.txt

Git • Stashing

Using the Service Container as a Dependency Injection Container

We can use the Service Container as a Dependency Injection Container by binding the creation process of objects with their dependencies in one point of the application Let's suppose that the creation of a PdfCreator needs two objects as dependencies; every time we need to build an instance of PdfCr...

Laravel • Services

What is Tail Call Optimization (TCO)

TCO is only available in strict mode As always check browser and Javascript implementations for support of any language features, and as with any javascript feature or syntax, it may change in the future. It provides a way to optimise recursive and deeply nested function calls by eliminating the n...

JavaScript • Tail Call Optimization

Recursive loops

Tail Call Optimisation makes it possible to safely implement recursive loops without concern for call stack overflow or the overhead of a growing frame stack. function indexOf(array, predicate, i = 0) { if (0 <= i && i < array.length) { if (predicate(array[i])) { return...

JavaScript • Tail Call Optimization

Installation or Setup

Log into your AWS Console and click on Lambda under the Services tab. Under Functions you'll be able to Create a Lambda function using the same-labeled button. You'll be shown a screen where you can select a blueprint. These are simply starting points to existing Lambda functions fo...

aws-lambda • Getting started with aws-lambda

Looping with async await

When using async await in loops, you might encounter some of these problems. If you just try to use await inside forEach, this will throw an Unexpected token error. (async() => { data = [1, 2, 3, 4, 5]; data.forEach(e => { const i = await somePromiseFn(e); console.log(i); }); ...

JavaScript • Async functions (async/await)

Custom HTML Helper - Display Name

/// <summary> /// Gets displayName from DataAnnotations attribute /// </summary> /// <typeparam name="TModel"></typeparam> /// <typeparam name="TProperty"></typeparam> /// <param name="htmlHelper"></param> /// <pa...

asp.net-mvc • Html Helpers

Custom Helper - Render submit button

/// <summary> /// Creates simple button /// </summary> /// <param name="poHelper"></param> /// <param name="psValue"></param> /// <returns></returns> public static MvcHtmlString SubmitButton(this HtmlHelper poHelper, string ps...

asp.net-mvc • Html Helpers

Scope functions and filters

AngularJS has digest loop and all your functions in a view and filters are executed every time the digest cycle is run. The digest loop will be executed whenever the model is updated and it can slow down your app (filter can be hit multiple times, before the page is loaded). You should avoid this: ...

AngularJS • Profiling and Performance

ngOptions

ngOptions is a directive that simplifies the creation of a html dropdown box for the selection of an item from an array that will be stored in a model. The ngOptions attribute is used to dynamically generate a list of <option> elements for the <select> element using the array or object o...

AngularJS • Built-in directives

Pagination in Laravel

In other frameworks pagination is headache. Laravel makes it breeze, it can generate pagination by adding few lines of code in Controller and View. Basic Usage There are many ways to paginate items, but the simplest one is using the paginate method on query builder or an Eloquent query. Laravel ou...

Laravel • Pagination

Installation or Setup

Using a CDN: <!DOCTYPE html> <head> <script src="https://cdn.jsdelivr.net/rxjs/4.1.0/rx.min.js"></script> </head> <body> <script> // `Rx` is available var one$ = Rx.Observable.of(1); var onesub = one$.subscribe(function (...

rxjs • Getting started with rxjs

Setup Server

You need to having a server running online. To securely associate your iOS app with a server, Apple requires that you make available a configuration file, called apple-app-site-association. This is a JSON file which describes the domain and supported routes. The apple-app-site-association file need...

iOS • Universal Links

Supporting Multiple Domains

Each domain supported in the app needs to make available its own apple-app-site-association file. If the content served by each domain is different, then the contents of the file will also change to support the respective paths. Otherwise, the same file can be used, but it needs to be accessible at ...

iOS • Universal Links

Signing the App-Site-Association File

Note: You can skip this part if your server uses HTTPS to serve content and jump to Application Setup guide. If your app targets iOS 9 and your server uses HTTPS to serve content, you don’t need to sign the file. If not (e.g. when supporting Handoff on iOS 8), it has to be signed using a SSL certif...

iOS • Universal Links

Setup iOS Application (Enabling Universal Links)

The setup on the app side requires two things: Configuring the app’s entitlement, and enabling the universal links by turning on the Associated Domains capability in the project. Handling Incoming Links in your AppDelegate. 1. Configuring the app’s entitlement, and enabling universal links. ...

iOS • Universal Links

Installation or Setup

Detailed instructions on getting facebook-graph-api set up or installed.

facebook-graph-api • Getting started with facebook-graph-api

Common Pitfalls: Accessing DOM from the `ready()` hook

A common usecase for the ready() hook is to access the DOM, e.g. to initiate a Javascript plugin, get the dimensions of an element etc. The problem Due to Vue's asynchronous DOM update mechanism, it's not guaranteed that the DOM has been fully updated when the ready() hook is called. This usually ...

Vue.js • Lifecycle Hooks

Function pointers

Pointers can also be used to point at functions. Let's take a basic function: int my_function(int a, int b) { return 2 * a + 3 * b; } Now, let's define a pointer of that function's type: int (*my_pointer)(int, int); To create one, just use this template: return_type_of_func (*my_fun...

C Language • Pointers