Tutorial by Topics: key

Keywords are predefined, reserved identifiers with special meaning to the compiler. They cannot be used as identifiers in your program without the @ prefix. For example @if is a legal identifier but not the keyword if. C# has a predefined collection of "keywords" (or reserved words) ...

When you use the yield keyword in a statement, you indicate that the method, operator, or get accessor in which it appears is an iterator. Using yield to define an iterator removes the need for an explicit extra class (the class that holds the state for an enumeration) when you implement the IEnumer...

MySQL: CREATE TABLE Employees ( Id int NOT NULL, PRIMARY KEY (Id), ... ); Others: CREATE TABLE Employees ( Id int NOT NULL PRIMARY KEY, ... );

This code will turn off the capability for a user to hold down the Shift key when opening a database to skip the default form opening and allow the user access to the Navigation Pane and VB Editor. In DB’s that you do not want users to have access to either of these (along with disabling the use ...

-- Create simple index CREATE INDEX index_name ON table_name(column_name1 [, column_name2, ...]) -- Create unique index CREATE UNIQUE INDEX index_name ON table_name(column_name1 [, column_name2, ...] -- Drop index DROP INDEX index_name ON tbl_name [algorithm_option | lock_option] ....

Certain words - so-called keywords - are treated specially in JavaScript. There's a plethora of different kinds of keywords, and they have changed in different versions of the language.

public static int myVariable; //Declaring a static variable public static myMethod() { } //Declaring a static method public static final double MY_CONSTANT; //Declaring a constant variable that is shared among all instances of the class public final double MY_CONSTANT; // Declaring a constant ...

const Type myVariable = initial; // Declares a const variable; cannot be changed const Type &myReference = myVariable; // Declares a reference to a const variable const Type *myPointer = &myVariable; // Declares a pointer-to-const. The pointer can change, but the underlying data member c...

map = %{} // creates an empty map map = %{:a => 1, :b => 2} // creates a non-empty map list = [] // creates an empty list list = [{:a, 1}, {:b, 2}] // creates a non-empty keyword list Elixir provides two associative data structures: maps and keyword lists. Maps are the Elixir key-...

Well-designed classes encapsulate their functionality, hiding their implementation while providing a clean, documented interface. This allows redesign or change so long as the interface is unchanged. In a more complex scenario, multiple classes that rely on each others' implementation details may ...

KVC :- Key-Value Coding Normally instance variables are accessed through properties or accessors but KVC gives another way to access variables in form of strings. In this way your class acts like a dictionary and your property name for example “age” becomes key and value that property holds becom...

AutoHotkey is a free, open-source custom scripting language for Microsoft Windows, initially aimed at providing easy keyboard shortcuts or hotkeys, fast macro-creation and software automation that allows users of most levels of computer skill to automate repetitive tasks in any Windows application...

Updating Vim key mappings allows you to solve two kinds of problems: Re-assigning key commands to letters that are more memorable or accessible, and creating key commands for functions which have none. Here you will learn about the various ways to [re]map key commands, and the context to which they...

keybindings:: ::abbreviation:: Return KeybindingsDetails^Ctrl key!Alt key+Shift key#Windows key{enter}send enter key{tab}send tab key*wildcard, any key can be pressed down~key's native function will not be blocked<symbolspecifies left key (<+ is left shift)>symbolspecifies right k...