Tutorial by Examples: nd

Installation and Usage

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...

ipython • Getting started with ipython

Fast and Efficient Checks

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,...

unity3d • Optimization

File handling

Re-Save open file under the same filename (Save): C-x C-s Write as filename (Save As): C-x C-w filename The new file name will be prompted in the minibuffer. Create new file or load existing file (New / Load): C-x C-f filename With the mnemonic here for f meaning file. You will...

emacs • Basic Keybindings

Abort current command

Often you will get into a state where you have a partially typed command sequence in progress, but you want to abort it. You can abort it with either of the following keybindings: C-g EscEscEsc

emacs • Basic Keybindings

Multiples windows or frames

"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...

emacs • Basic Keybindings

Configure on Demand

If profiling your build shows significant time spend in Configuring Projects, the Configure on Demand option might improve your performance. You can enable Configure on Demand mode by editing $GRADLE_USER_HOME/.gradle/gradle.properties (~/.gradle/gradle.properties by default), and setting org.gradl...

gradle • Gradle Performance

Declare and assign a fixed-width string

'Declare and assign a 1-character fixed-width string Dim middleInitial As String * 1 'middleInitial must be 1 character in length middleInitial = "M" 'Declare and assign a 2-character fixed-width string `stateCode`, 'must be 2 characters in length Dim stateCode As String * 2 stateC...

VBA • Declaring and assigning strings

Declare and assign a string array

'Declare, dimension and assign a string array with 3 elements Dim departments(2) As String departments(0) = "Engineering" departments(1) = "Finance" departments(2) = "Marketing" 'Declare an undimensioned string array and then dynamically assign with 'the results...

VBA • Declaring and assigning strings

Text Indent

p { text-indent: 50px; } The text-indent property specifies how much horizontal space text should be moved before the beginning of the first line of the text content of an element. Resources: Indenting only the first line of text in a paragraph? https://www.w3.org/TR/CSS21/text.html#pr...

CSS • Typography

Referring to the declared generic type within its own declaration

How do you go about using an instance of a (possibly further) inherited generic type within a method declaration in the generic type itself being declared? This is one of the problems you will face when you dig a bit deeper into generics, but still a fairly common one. Assume we have a DataSeries&l...

Java Language • Generics

Change primary key and timestamps

By default, Eloquent models expect for the primary key to be named 'id'. If that is not your case, you can change the name of your primary key by specifying the $primaryKey property. class Citizen extends Model { protected $primaryKey = 'socialSecurityNo'; // ... } Now, any Eloqu...

Laravel • Eloquent

Throw 404 if entity not found

If you want to automatically throw an exception when searching for a record that isn't found on a modal, you can use either Vehicle::findOrFail(1); or Vehicle::where('make', 'ford')->firstOrFail(); If a record with the primary key of 1 is not found, a ModelNotFoundException is thrown. W...

Laravel • Eloquent

Reading and writing DataObjects

DataObjects in SilverStripe represent a database table row. The fields in the model have magic methods that handle getting and setting data via their property names. Given we have a simple DataObject as an example: class Fruit extends DataObject { private static $db = ['Name' => 'Varchar'...

silverstripe • Using the ORM

A View Bound to Existing HTML

Assuming this HTML in the page: <body> <div id="myPage"> </div> </body> A view can be bound to it with: var MyPageView = Backbone.View.extend( { "el": "#myPage", "template": _.template( "<p>This is m...

backbone.js • View

Use Format to convert and format a numeric type as a string

Const zipCode As long = 10012 Dim zeroPaddedNumber As String zeroPaddedZipCode = Format(zipCode, "00000000") 'zeroPaddedNumber = "00010012"

VBA • Converting other types to strings

Separating distribution specific tasks and variables inside a role

We can easily separate distribution specific tasks and variables into different dedicated .yml files. Ansible helps us to automatically identify the target hosts distribution via {{ ansible_distribution }} and {{ ansible_distribution_version }}, so we just have to name the distribution dedicated .y...

ansible • Roles

Using an httpHandler (.ashx) to download a file from a specific location

Create a new httpHandler inside your ASP.NET project. Apply the following code (VB) to the handler file: Public Class AttachmentDownload Implements System.Web.IHttpHandler Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest ' pass an ID thr...

ASP.NET • httpHandlers

Using Bundling / Minification

The way the $scope is injected in the controller's constructor functions is a way to demonstrate and use the basic option of angular dependency injection but is not production ready as it cannot be minified. Thats because the minification system changes the variable names and anguar's dependency i...

AngularJS • Using AngularJS with TypeScript

Use InStr to find the position of the first instance of a substring

Const baseString As String = "Foo Bar" Dim containsBar As Boolean Dim posB As Long posB = InStr(1, baseString, "B", vbBinaryCompare) 'posB = 5

VBA • Searching within strings for the presence of substrings

Use InStrRev to find the position of the last instance of a substring

Const baseString As String = "Foo Bar" Dim containsBar As Boolean 'Find the position of the last "B" Dim posX As Long 'Note the different number and order of the paramters for InStrRev posX = InStrRev(baseString, "X", -1, vbBinaryCompare) 'posX = 0

VBA • Searching within strings for the presence of substrings