Tutorial by Examples: v

You can use any ruby technique to dynamically create a list of files to load. Illustration of globbing for files starting with test, loaded in alphabetical order. Dir[ "#{ __dir__ }**/test*.rb" ) ].sort.each do |source| require_relative source end

DECLARE @DateFrom DATETIME = '2016-06-01 06:00' DECLARE @DateTo DATETIME = '2016-07-01 06:00' DECLARE @IntervalDays INT = 7 -- Transition Sequence = Rest & Relax into Day Shift into Night Shift -- RR (Rest & Relax) = 1 -- DS (Day Shift) = 2 -- NS (Night Shift) = 3 ;WITH roster AS ...

Visual Studio Code is an open-source and feature-rich code editor from Microsoft. To set it up it for NativeScript development, open the Command Palette (F1 or ⌘+Shift+P) and type ext install NativeScript. Once the NativeScript extension is installed, the debugger should allow you to set breakpoint...

Named Functions defmodule Math do # one way def add(a, b) do a + b end # another way def subtract(a, b), do: a - b end iex> Math.add(2, 3) 5 :ok iex> Math.subtract(5, 2) 3 :ok Private Functions defmodule Math do def sum(a, b) do a...

Enable USB Debugging on your device and from command line type adb devices. If everything is OK, the response should be: List of devices attached 1234567890 device Where 1234567890 is the device's id. If multiple devices are connected, you should see all of them: List of devices at...

Named vector can be created in several ways. With c: xc <- c('a' = 5, 'b' = 6, 'c' = 7, 'd' = 8) which results in: > xc a b c d 5 6 7 8 with list: xl <- list('a' = 5, 'b' = 6, 'c' = 7, 'd' = 8) which results in: > xl $a [1] 5 $b [1] 6 $c [1] 7 $d [1] 8 Wi...

Binding is the process of assigning an object to an identifier or variable name. Early binding (also known as static binding) is when an object declared in Excel is of a specific object type, such as a Worksheet or Workbook. Late binding occurs when general object associations are made, such as the ...

Autoboxing can come at a substantial memory overhead. For example: Map<Integer, Integer> square = new HashMap<Integer, Integer>(); for(int i = 256; i < 1024; i++) { square.put(i, i * i); // Autoboxing of large integers } will typically consume substantial amount of memory (...

Swift //Swift let viewController = UIViewController() let navigationController = UINavigationController(rootViewController: viewController) //Objective-C UIViewController *viewController = [[UIViewController alloc] init]; UINavigationController *navigationController = [[UINavigationControlle...

//Swift let fooViewController = UIViewController() navigationController?.pushViewController(fooViewController, animated: true) //Objective-C UIViewController *fooViewController = [[UIViewController alloc] init]; [navigationController pushViewController:fooViewController animated:YES];

As we know that we should use synchronized keyword to make execution of a method or block exclusive. But few of us may not be aware of one more important aspect of using synchronized and volatile keyword: apart from making a unit of code atomic, it also provides read / write barrier. What is this re...

Go to editor (from tool window) Esc Switching focus to corresponding tool window Windows: Alt + <tool window number> OS X / macOS: Cmd + <tool window number> For example switching focus to the project window Windows: Alt + 1 OS X / macOS: Cmd + 1 Recent files popup Windows: Ctrl...

lazy val is a language feature where the initialization of a val is delayed until it is accessed for the first time. After that point, it acts just like a regular val. To use it add the lazy keyword before val. For example, using the REPL: scala> lazy val foo = { | println("Initial...

If you have both Python 3 and Python 2 installed, you can specify which version of Python you would like pip to use. This is useful when packages only support Python 2 or 3 or when you wish to test with both. If you want to install packages for Python 2, run either: pip install [package] or: p...

The observer pattern lets users of a class subscribe to events that happen when this class processes data etc. and be notified when these event occur. In the following example we create a processing class and an observer class which will be notified while processing a phrase - if it finds words that...

Realm currently does not support storing a list of primitives. It is on their todo list (GitHub issue #575), but for the meantime, here is a workaround. Create a new class for your primitive type, this uses Integer, but change it for whatever you want to store. public class RealmInteger extends Re...

In C, all function parameters are passed by value, so modifying what is passed in callee functions won't affect caller functions' local variables. #include <stdio.h> void modify(int v) { printf("modify 1: %d\n", v); /* 0 is printed */ v = 42; printf("modify 2:...

def foobar(foo=None, bar=None): return "{}{}".format(foo, bar) values = {"foo": "foo", "bar": "bar"} foobar(**values) # "foobar"

Variables are annotated using comments: x = 3 # type: int x = negate(x) x = 'a type-checker might catch this error' Python 3.x3.6 Starting from Python 3.6, there is also new syntax for variable annotations. The code above might use the form x: int = 3 Unlike with comments, it is also pos...

The dot function can also be used to compute vector dot products between two one-dimensional numpy arrays. >>> v = np.array([1,2]) >>> w = np.array([1,2]) >>> v.dot(w) 5 >>> np.dot(w,v) 5 >>> np.dot(v,w) 5