Tutorial by Topics: def

Default Method introduced in Java 8, allows developers to add new methods to an interface without breaking the existing implementations of this interface. It provides flexibility to allow the interface to define an implementation which will be used as default when a class which implements that inter...

In C, some expressions yield undefined behavior. The standard explicitly chooses to not define how a compiler should behave if it encounters such an expression. As a result, a compiler is free to do whatever it sees fit and may produce useful results, unexpected results, or even crash. Code that i...

ASDF - Another System Definition Facility ASDF is a tool for specifying how systems of Common Lisp software are made up of components (sub-systems and files), and how to operate on these components in the right order so that they can be compiled, loaded, tested, etc.

Function functionName(argumentVariable As dataType, argumentVariable2 As dataType, Optional argumentVariable3 As dataType) As functionReturnDataType Basic declaration of a function. Every function needs a name, but it does not have to take any arguments. It may take 0 arguments, or it may take ...

Violations of aliasing rules and of violating the effective type of an object are two different things and should not be confounded. Aliasing is the property of two pointers a and b that refer to the same object, that is that a == b. The effective type of a data object is used by C to de...

What is undefined behavior (UB)? According to the ISO C++ Standard (§1.3.24, N4296), it is "behavior for which this International Standard imposes no requirements." This means that when a program encounters UB, it is allowed to do whatever it wants. This often means a crash, but it may si...

Convention is a set of default rules to automatically configure a conceptual model based on domain class definitions when working with Code-First. Code-First conventions are defined in System.Data.Entity.ModelConfiguration.Conventions namespace (EF 5 & EF 6).

The typedef mechanism allows the creation of aliases for other types. It does not create new types. People often use typedef to improve the portability of code, to give aliases to structure or union types, or to create aliases for function (or function pointer) types. In the C standard, typedef i...

A defer statement pushes a function call onto a list. The list of saved calls is executed after the surrounding function returns. Defer is commonly used to simplify functions that perform various clean-up actions. defer someFunc(args) defer func(){ //code goes here }() Defer works by...

In R, tabular data is stored in data frames. This topic covers the various ways of transforming a single table. Helpful packages Reshaping, stacking and splitting with data.table Reshape using tidyr splitstackshape

Source: What is the difference between a definition and a declaration? Source (For weak and strong symbols): https://www.amazon.com/Computer-Systems-Programmers-Perspective-2nd/dp/0136108040/

UserDefaults.standard.set(dic, forKey: "LoginSession") //Save value inside userdefaults UserDefaults.standard.object(forKey: "LoginSession") as? [String:AnyObject] ?? [:] //Get value from UserDefaults NSUserDefault which are used to store all type of DataType, a...

As val are semantically static, they are initialized "in-place" wherever they appear in the code. This can produce surprising and undesirable behavior when used in abstract classes and traits. For example, let's say we would like to make a trait called PlusOne that defines an increment ...

By default Compose sets up a single network for your app. Each container for a service joins the default network and is both reachable by other containers on that network, and discoverable by them at a hostname identical to the container name. Links allow you to define extra aliases by which...

config.active_record.default_timezone determines whether to use Time.local (if set to :local) or Time.utc (if set to :utc) when pulling dates and times from the database. The default is :utc. http://guides.rubyonrails.org/configuring.html If you want to change Rails timezone, but continue ...