Tutorial by Topics: ons

A function in the *apply family is an abstraction of a for loop. Compared with the for loops *apply functions have the following advantages: Require less code to write. Doesn't have an iteration counter. Doesn't use temporary variables to store intermediate results. However for loops are m...

var regExp = RegExp(r'^(.*)$', multiLine: true, caseSensitive: false); ParameterDetailsString sourceThe regular expression as a String{bool multiline}Whether this is a multiline regular expression. (matches ^ and $ at the beginning and end of each line individually not the whole String){bool...

It's often necessary to run maintenance scripts on your database. Fields get renamed; data structures get changed; features that you used to support get removed; services get migrated. The list of reasons why you might want to change your schema is pretty limitless. So, the 'why' is pretty self ex...

Declaration of identifier referring to object or function is often referred for short as simply a declaration of object or function.

Many Git commands take revision parameters as arguments. Depending on the command, they denote a specific commit or, for commands which walk the revision graph (such as git-log(1)), all commits which can be reached from that commit. They are usually denoted as <commit>, or <rev>, or &l...

Aggregations are methods allowing the execution of operations on (individual and/or groups of) rows of objects derived from a Model.

@AnAnnotation def someMethod = {...} @AnAnnotation class someClass {...} @AnnotatioWithArgs(annotation_args) def someMethod = {...} ParameterDetails@Indicates that the token following is an annotation.SomeAnnotationThe name of the annotationconstructor_args(optional) The arguments passed t...

$ shopt -u option # Deactivate Bash's built-in 'option' $ shopt -s option # Activate Bash's built-in 'option' Character Classes Valid character classes for the [] glob are defined by the POSIX standard: alnum alpha ascii blank cntrl digit graph lower print punct space upper word xdig...

if expression ... end if expression ... else ... end if expression ... elseif expression ... end if expression ... elseif expression ... else ... end ParameterDescriptionexpressionan expression that has logical meaning

Session["Session_Key"] = Obj_Value; HTTP is stateless. ASP.NET session state is a framework that facilitates maintaining state between HTTP page requests. Session differs from the class level variables in its ability to remain available across post-backs and different pages. For ...

Parallel collections facilitate parallel programming by hiding low-level parallelization details. This makes taking advantage of multi-core architectures easy. Examples of parallel collections include ParArray, ParVector, mutable.ParHashMap, immutable.ParHashMap, and ParRange. A full list can be f...

constexpr is a keyword that can be used to mark a variable's value as a constant expression, a function as potentially usable in constant expressions, or (since C++17) an if statement as having only one of its branches selected to be compiled. The constexpr keyword was added in C++11 but for a...