Tutorial by Examples: me

Common Lisp already has a reverse function, but if it didn't, then it could be implemented easily using reduce. Given a list like (1 2 3) === (cons 1 (cons 2 (cons 3 '()))) the reversed list is (cons 3 (cons 2 (cons 1 '()))) === (3 2 1) That may not be an obvious use of reduce, but if we ha...

The intrinsic pack function packs an array into a vector, selecting elements based on a given mask. The function has two forms PACK(array, mask) PACK(array, mask, vector) (that is, the vector argument is optional). In both cases array is an array, and mask of logical type and conformable with...

trait HelloWorld { public function sayHello() { echo 'Hello World!'; } } // Change visibility of sayHello class MyClass1 { use HelloWorld { sayHello as protected; } } // Alias method with changed visibility // sayHello visibility not changed class MyClass2 { u...

Problem: Some data needs to be passed to a scene loaded from a fxml. Solution Specify a controller factory that is responsible for creating the controllers. Pass the data to the controller instance created by the factory. FXML <?xml version="1.0" encoding="UTF-8"?> &...

Python 3 allows you to define function arguments which can only be assigned by keyword, even without default values. This is done by using star * to consume additional positional parameters without setting the keyword parameters. All arguments after the * are keyword-only (i.e. non-positional) arg...

A common task is to convert all columns of a data.frame to character class for ease of manipulation, such as in the cases of sending data.frames to a RDBMS or merging data.frames containing factors where levels may differ between input data.frames. The best time to do this is when the data is read ...

Metaclass syntax Python 2.x2.7 class MyClass(object): __metaclass__ = SomeMetaclass Python 3.x3.0 class MyClass(metaclass=SomeMetaclass): pass Python 2 and 3 compatibility with six import six class MyClass(six.with_metaclass(SomeMetaclass)): pass

Placeholders in the query string need to be set by using the set* methods: String sql = "SELECT * FROM EMP WHERE JOB = ? AND SAL > ?"; //Create statement to make your operations PreparedStatement statement = connection.prepareStatement(sql); statement.setString(1, "MANAGER&...

Member functions of a class can be declared const, which tells the compiler and future readers that this function will not modify the object: class MyClass { private: int myInt_; public: int myInt() const { return myInt_; } void setMyInt(int myInt) { myInt_ = myInt; } }; In a ...

document.getElementsByClassName('class-name') will retrieve <a class="class-name">Any</a> <b class="class-name">tag</b> <div class="class-name an-extra-class">with that class.</div> If no existing elements contain the given c...

document.getElementsByTagName('b') will retrieve <b>All</b> <b>of</b> <b>the b elements.</b> If no elements with the given tag name exist, an empty collection will be returned.

<link rel="stylesheet" href="test.css" media="print"> Media specifies what style sheet should be used for what type of media. Using the print value would only display that style sheet for print pages. The value of this attribute can be any of the mediatype val...

The SDK supports time triggered based on CRON expressions with 6 fields ({second} {minute} {hour} {day} {month} {day of the week}). It requires an extra setting on the JobHostConfiguration: config.UseTimers(); Your time triggered functions respond to this syntax: // Runs once every 5 minutes p...

extern crate serde; extern crate serde_json; #[macro_use] extern crate serde_derive; #[derive(Serialize)] struct Person { #[serde(rename="firstName")] first_name: String, #[serde(rename="lastName")] last_name: String, } fn main() { let person = ...

Meteor Tool To check the installed version of the Meteor tool, just run the following command outside of any Meteor projects: meteor --version To get a list of all official (recommended) Meteor releases, run: meteor show METEOR Meteor Projects If you want to check the project version of Me...

The Meteor Tool will notify you when a newer release is available. To update Meteor projects to the latest release, execute the following command inside a Meteor project: meteor update In case you want to update your Meteor project to a specific Meteor release, run the following command inside ...

// Converts the string representation of a date and time to its DateTime equivalent var dateTime = DateTime.Parse("14:23 22 Jul 2016"); Console.WriteLine(dateTime.ToString());

// Converts the specified string representation of a date and time to its DateTime equivalent and returns a value that indicates whether the conversion succeeded string[] dateTimeStrings = new []{ "14:23 22 Jul 2016", "99:23 2x Jul 2016", "22/7/2016 14:23:0...

Dim array2D(,) As Integer = {{1, 2, 3}, {4, 5, 6}} ' array2D(0, 0) is 1 ; array2D(0, 1) is 2 ; array2D(1, 0) is 4 Dim array3D(,,) As Integer = {{{1, 2, 3}, {4, 5, 6}}, {{7, 8, 9}, {10, 11, 12}}} ' array3D(0, 0, 0) is 1 ; array3D(0, 0, 1) is 2 ' array3D(0, 1, 0) is 4 ; array3D(1, 0, 0) is 7 ...

You can test if a string matches several regular expressions using a switch statement. Example case "Ruby is #1!" when /\APython/ puts "Boooo." when /\ARuby/ puts "You are right." else puts "Sorry, I didn't understand that." end This w...