Tutorial by Examples: u

Factorial Function using Pattern Matching

let rec factorial n = match n with | 0 | 1 -> 1 | n -> n * (factorial (n - 1)) This function matches on both the values 0 and 1 and maps them to the base case of our recursive definition. Then all other numbers map to the recursive call of this function.

OCaml • Pattern Matching

Const member functions

Member functions of a class can be declared const, which tells the compiler and future readers that this function will not modify the object: class MyClass { private: int myInt_; public: int myInt() const { return myInt_; } void setMyInt(int myInt) { myInt_ = myInt; } }; In a ...

C++ • const keyword

Anonymous functions and function handles

Basics Anonymous functions are a powerful tool of the MATLAB language. They are functions that exist locally, that is: in the current workspace. However, they do not exist on the MATLAB path like a regular function would, e.g. in an m-file. That is why they are called anonymous, although they can h...

MATLAB Language • Getting started with MATLAB Language

Why save user data in the database

Firebase Authentication allows the users of your app to sign-in with social providers or their email+password. But what if you want to store additional information about a user, beyond what Firebase Authentication allows you to specify? Or what if you want to display a list of the users in your app...

firebase • How to use the Firebase Database to keep a list of Firebase Authentication users

Link 'media' attribute

HTML • Linking Resources

git-tfs push

Push all local commits to the TFVS remote. $ git tfs rcheckin Note: this will fail if Check-in Notes are required. These can be bypassed by adding git-tfs-force: rcheckin to the commit message.

Git • git-tfs

AsRef & AsMut

std::convert::AsRef and std::convert::AsMut are used for cheaply converting types to references. For types A and B, impl AsRef<B> for A indicates that a &A can be converted to a &B and, impl AsMut<B> for A indicates that a &mut A can be converted to a &mut B. Thi...

Rust • Conversion traits

Borrow, BorrowMut and ToOwned

The std::borrow::Borrow and std::borrow::BorrowMut traits are used to treat borrowed types like owned types. For types A and B, impl Borrow<B> for A indicates that a borrowed A may be used where a B is desired. For instance, std::collections::HashMap.get() uses Borrow for its get() method,...

Rust • Conversion traits

Deref & DerefMut

The std::ops::Deref and std::ops::DerefMut traits are used for overloading the dereference operator, *x. For types A and B, impl Deref<Target=B> for A indicates that dereferencing a binding of &A will yield a &B and, impl DerefMut for A indicates that dereferencing a binding of...

Rust • Conversion traits

Routes are matched in the order they are declared

This is a common gotcha with Laravel routes. Routes are matched in the order that they are declared. The first matching route is the one that is used. This example will work as expected: Route::get('/posts/{postId}/comments/{commentId}', 'CommentController@show'); Route::get('/posts/{postId}', 'P...

Laravel • Routing

Serialization-Deserialization using Newtonsoft.Json

Unlike the other helpers, this one uses static class helpers to serialize and deserialize, hence it is a little bit easier than the others to use. using Newtonsoft.Json; var rawJSON = "{\"Name\":\"Fibonacci Sequence\",\"Numbers\":[0, 1, 1, 2, 3, 5, 8, 13]}...

.NET Framework • JSON Serialization

Triggers for Queues

A simple example defining a Function that gets triggered by a Queue message: public static void StringMessage([QueueTrigger("my_queue")] string plainText) { //... } It also supports POCO serialization: public static void POCOMessage([QueueTrigger("my_queue")] MyPO...

azure-webjobs • Azure Webjobs SDK

Understanding build progress

Sometimes builds take longer than expected. There are a few environment variables you can set to better understand what's happening during the build process. METEOR_DEBUG_BUILD=1 (logs progress) METEOR_PROFILE=<n> (logs time spent) METEOR_DEBUG_SPRINGBOARD=1 (?) METEOR_DEBUG_...

meteor • Getting started with meteor

Updating Meteor Projects & Installed Packages

The Meteor Tool will notify you when a newer release is available. To update Meteor projects to the latest release, execute the following command inside a Meteor project: meteor update In case you want to update your Meteor project to a specific Meteor release, run the following command inside ...

meteor • Getting started with meteor

Leaflet Quick Start

<!DOCTYPE html> <html> <head> <title>My Leaflet Map</title> <link rel="stylesheet" href="//unpkg.com/[email protected]/dist/leaflet.css" /> <style type="text/css"> #map { height: 500px; ...

leaflet • Getting started with leaflet

Form Tag Helper - With custom route attributes

<form asp-action="create" asp-controller="Home" asp-route-returnurl="dashboard" asp-route-from="google">  </form> This will generate the below markup <form action=&qu...

asp.net-core • Tag Helpers

Input Tag Helper

Assuming your view is strongly typed to a view model like public class CreateProduct { public string Name { set; get; } } And you are passing an object of this to the view from your action method. @model CreateProduct <form asp-action="create" asp-controller="Home"...

asp.net-core • Tag Helpers

Extensions and interfaces together enable DRY code and mixin-like functionality

Extension methods enable you to simplify your interface definitions by only including core required functionality in the interface itself and allowing you to define convenience methods and overloads as extension methods. Interfaces with fewer methods are easier to implement in new classes. Keeping o...

C# Language • Extension Methods

Why we use interfaces

An interface is a definition of a contract between the user of the interface and the class that implement it. One way to think of an interface is as a declaration that an object can perform certain functions. Let's say that we define an interface IShape to represent different type of shapes, we exp...

C# Language • Interfaces

Installation or Setup

Shiny can run as a standalone application on your local computer, on a server that can provide shiny apps to multiple users (using shiny server), or on shinyapps.io. Installing Shiny on a local computer: in R/RStudio, run install.packages("shiny") if installing from CRAN, or devtools::i...

shiny • Getting started with shiny