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This section provides an overview of what firebase-database is, and why a developer might want to use it. It should also mention any large subjects within firebase-database, and link out to the related topics. Since the Documentation for firebase-database is new, you may need to create initial v...

var foo [= value [, foo2 [, foo3 ... [, fooN]]]]; let bar [= value [, bar2 [, foo3 ... [, barN]]]]; const baz = value [, baz2 = value2 [, ... [, bazN = valueN]]]; See also: Reserved Keywords Scope

let name = json["name"] as? String ?? "" // Output: john let name = json["name"] as? String // Output: Optional("john") let name = rank as? Int // Output: Optional(1) let name = rank as? Int ?? 0 // Output: 1 let name = dictionary as? [...

Inside a specific node /path to/element[@attribute_name] Anywhere in the document //*[@attribute_name] Inside a specific node with some value /path to/element[@attribute_name='search value'] /path to/element[@attribute_name="search value"] Anywhere in the documen...

What is Functional Programming ? Functional Programming or FP is a programming paradigm that is built upon two main concepts immutability, and statelessness.The goal behind FP is to make your code more readable, reusable, and portable. What is Functional JavaScript There has been a debate to ca...

session$sendCustomMessage(name,list of parameters) Shiny.addCustomMessageHandler(name, JS function that accepts list of parameters) Shiny.onInputChange(name,value)

How to exract tar.gz/bz2/tbz files : If Your File Extension is .tar.gz (or .tgz) use this command tar xvzf file.tar.gz x: This tells tar to extract the files. v: This option will list all of the files one by one in the archive. The “v” stands for “verbose.” z: The z option is ...

Using Java, developers have the ability to define a class within another class. Such a class is called a Nested Class. Nested Classes are called Inner Classes if they were declared as non-static, if not, they are simply called Static Nested Classes. This page is to document and provide details with ...

This section provides an overview of what asp.net-web-api2 is, and why a developer might want to use it. It should also mention any large subjects within asp.net-web-api2, and link out to the related topics. Since the Documentation for asp.net-web-api2 is new, you may need to create initial vers...

CREATE [TEMPORARY] [EXTERNAL] TABLE [IF NOT EXISTS] [db_name.]table_name [(col_name data_type [COMMENT col_comment], ...)] [COMMENT table_comment] [PARTITIONED BY (col_name data_type [COMMENT col_comment], ...)] [CLUSTERED BY (col_name, col_name, ...) [SORTED BY (col_name [ASC|DESC], ...)] I...

unpickled_string = pickle.loads(string) unpickled_string = pickle.load(file_object) pickled_string = pickle.dumps([('', 'cmplx'), {('object',): None}], pickle.HIGHEST_PROTOCOL) pickle.dump(('', 'cmplx'), {('object',): None}], file_object, pickle.HIGHEST_PROTOCOL) unjsoned_string = json.loads(s...

Firebase Realtime Database Rules determine who has read and write access to your database, how your data is structured, and what indexes exist. These rules live on the Firebase servers and are enforced automatically at all times. Every read and write request will only be completed if your rules al...

With Firebase Realtime Database, your Database rules is your server side security. You need to be very careful and aware of who has access to your database. It is important that no one gains access to your data that shouldn't. By default, the Firebase Realtime Database rules allow any authenticated...