Tutorial by Topics: ion

An exception is an object that represents the occurrence of an exceptional condition. In other words, it indicates that something went wrong. In Ruby, exceptions are often referred to as errors. That's because the base Exception class exists as a top-level exception object element, but user-defin...

CAAnimation is an abstract animation class. It provides the basic support for the CAMediaTiming and CAAction protocols. To animate Core Animation layers or Scene Kit objects, create instances of the concrete subclasses CABasicAnimation, CAKeyframeAnimation, CAAnimationGroup, or CATransition. ...

Function([DISTINCT] expression) -DISTINCT is an optional parameter AVG ( [ ALL | DISTINCT ] expression ) COUNT( { [ALL | DISTINCT ] expression ] | * } ) GROUPING(<column_expression>) MAX ( [ ALL | DISTINCT ] expression ) MIN ( [ ALL | DISTINCT ] expression ) SUM ( [ ALL | DISTINCT ] e...

In C, it is common to use return values to denote errors that occur; and to return data through the use of passed in pointers. This can be done for multiple reasons; including not having to allocate memory on the heap or using static allocation at the point where the function is called.

The Go compiler can produce binaries for many platforms, i.e. processors and systems. Unlike with most other compilers, there is no specific requirement to cross-compiling, it is as easy to use as regular compiling. GOOS=linux GOARCH=amd64 go build Supported Operating System and Archite...

ActionScript 3 is the programming language for the Adobe Flash Player and Adobe AIR runtime environments. It is object-oriented ECMAScript based language used primary for native application development on desktop (Windows/Mac) and mobile (iOS/Android) devices. Adobe learning resources: http://ww...

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 ...

From the documentation: The UINavigationController class implements a specialized view controller that manages the navigation of hierarchical content. This navigation interface makes it possible to present your data efficiently and makes it easier for the user to navigate that content. You gene...

Terms and concepts Screen size Actual physical size, measured as the screen's diagonal. For simplicity, Android groups all actual screen sizes into four generalized sizes: small, normal, large, and extra-large. Screen density The quantity of pixels within a physical area of the screen; usu...

Column typeDescription:primary_keyPrimary key:stringShorter string datatype. Allows limit option for maximum number of characters.:textLonger amount of text. Allows limit option for maximum number of bytes.:integerInteger. Allows limit option for maximum number of bytes.:bigintLarger integer:float...

Functions and subroutines, in conjunction with modules, are the tools to break down a program into units. This makes the program more readable and manageable. Each one of these units can be thought of as part of the code that, ideally, could be compiled and tested in isolation. The main program(s...

Conditional expressions, involving keywords such as if, elif, and else, provide Python programs with the ability to perform different actions depending on a boolean condition: True or False. This section covers the use of Python conditionals, boolean logic, and ternary statements. <expressi...

String functions perform operations on string values and return either numeric or string values. Using string functions, you can, for example, combine data, extract a substring, compare strings, or convert a string to all uppercase or lowercase characters. CONCAT ( string_value1, string_value...

The Option<T> type is Rust's equivalent of nullable types, without all the issues that come with it. The majority of C-like languages allow any variable to be null if there is no data present, but the Option type is inspired by functional languages which favour 'optionals' (e.g. Ha...