Tutorial by Topics: se

Serial.begin(speed) // Opens the serial port on the given baud rate Serial.begin(speed, config) Serial[1-3].begin(speed) // Arduino Mega only! When writing 1-3 it means you can choose between the numbers 1 to 3 when choosing the serial port. Serial[1-3].begin(speed, config) // Arduino Mega onl...

Given an R object, we may require separate analysis for one or more parts of the data contained in it. The process of obtaining these parts of the data from a given object is called subsetting. Missing values: Missing values (NAs) used in subsetting with [ return NA since a NA index picks ...

Standard syntax: INSERT OVERWRITE TABLE tablename1 [PARTITION (partcol1=val1, partcol2=val2 ...) [IF NOT EXISTS]] select_statement1 FROM from_statement; INSERT INTO TABLE tablename1 [PARTITION (partcol1=val1, partcol2=val2 ...)] select_statement1 FROM from_statement; INSERT INTO T...

Simple classes RegexMatches[abc]Any of the following characters: a, b, or c[a-z]Any character from a to z, inclusive (this is called a range)[0-9]Any digit from 0 to 9, inclusive Common classes Some groups/ranges of characters are so often used, they have special abbreviations: RegexMatche...

Devise is a very powerful gem, it allows you to sign up, sign in and sign out options just after installing. Moreover user can add authentications and restrictions to its applications. Devise also come with its own views, if user wants to use. A user can also customize sign up and sign in forms acco...

Selenium is a powerful library of commands in multiple languages (C#, Haskell, Java, JavaScript, Objective-C, Perl, PHP, Python, R, and Ruby) that allow a programmer to automate browser interaction. This is incredibly useful for developers testing applications. Selenium offers methods to: Find...

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.

serialize($object) unserialize($object) All PHP types except for resources are serializable. Resources are a unique variable type that reference "external" sources, such as database connections.

Typeclasses in Haskell are a means of defining the behaviour associated with a type separately from that type's definition. Whereas, say, in Java, you'd define the behaviour as part of the type's definition -- i.e. in an interface, abstract class or concrete class -- Haskell keeps these two things s...

AnnotationColumn@ControllerIndicates that an annotated class is a "Controller" (web controller).@RequestMappingAnnotation for mapping web requests onto specific handler classes (if we used with class) and/or handler methods (if we used with methods).method = RequestMethod.GETType of HTT...