Tutorial by Examples: in

Recovering from panic

A common mistake is to declare a slice and start requesting indexes from it without initializing it, which leads to an "index out of range" panic. The following code explains how to recover from the panic without exiting the program, which is the normal behavior for a panic. In most situat...

Exporting your public key

In order for your public-private keypair to be of use, you must make your public key freely available to others. Be sure that you are working with your public key here since you should never share your private key. You can export your public key with the following command: gpg —armor —export EMAI...

Setting up Firebase for IOS

Firstly, you want to go to firebase dashboard and create a new project using the 'Create New Project' button. You want to create a new project by adding the name of your app for example I put mine as 'Cool app name' then choose your region and press 'Create Project' After creating pr...

Paging list items returned from a query

To simulate paging using REST you can do the following: Use the $skip=n parameter to skip the first n entries according to the $orderby parameter Use the $top=n parameter to return the top n entries according to the $orderby and $skip parameters. var endpointUrl = "/_api/lists('g...

Define custom managers

Very often it happens to deal with models which have something like a published field. Such kind of fields are almost always used when retrieving objects, so that you will find yourself to write something like: my_news = News.objects.filter(published=True) too many times. You can use custom mana...

Change Navbar breakpoint (mobile vs normal)

max-width is the breakpoint @media (max-width: 1200px) { .navbar-header { float: none; } .navbar-left,.navbar-right { float: none !important; } .navbar-toggle { display: block; } .navbar-collapse { border-top: 1px solid transpar...

Close collapsed navbar when clicking outside of the navbar

jQuery('body').bind('click', function(e) { if(jQuery(e.target).closest('#navbar').length == 0) { // click happened outside of .navbar, so hide var opened = jQuery('.navbar-collapse').hasClass('collapse in'); if ( opened === true ) { jQuery('#navbar2 .navb...

Using MarkupExtension with Converters to skip recource declaration

Usually to use the converter, we have to define it as resource in the following way: <converters:SomeConverter x:Key="SomeConverter"/> It is possible to skip this step by defining a converter as MarkupExtension and implementing the method ProvideValue. The following example conve...

Basic webpage using bootstrap components

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1">...

Insert data

ECMA 6: const user = new User({ name: 'Stack', password: 'Overflow', }) ; user.save((err) => { if (err) throw err; console.log('User saved!'); }); ECMA5.1: var user = new User({ name: 'Stack', password: 'Overflow', }) ; user.save(function (err) { ...

Catching and handling errors in user code

On error move to labelled code and see if there is a specific error that needs to be handled. Public Const cErrCodeNotNumber = 2262 ' This value must be a number. Public Const cErrCodeNumericOverflow = 2263 ' The number is too large. Private Sub MySub() Dim objConn As ADODB.Connection ...

Binding modes and defaults

There are three modes of XAML bindings exists for either Binding and x:Bind: OneTime: Update happens only once, on initialization of the view during InitializeComponent() call. (ViewModel[sends data when initializing] -> View) OneWay: View is updated when ViewModel changes. But not in the rev...

When to use x:Bind

When calling methods directly from the view. If performance matters really bad (scientific spaceship stuff) When you want to get compile time errors

When to use Binding

Use it if you want to be flexible about the source type of your data. It won't bind to an actual property but to its name. If you want to bind to the DataContext

cd command, directories explained

michael@who-cares:~$ The symbol ~ after the who-cares: is the current directory. ~ actually means the person's home directory. In this case, that's /home/michael. michael@who-cares:~$ cd Downloads michael@who-cares:~/Downloads$ Looks for Downloads in the current directory, then makes that th...

Gentoo/Funtoo Installation

Elixir is available in main packages repository. Update the packages list before installing any package: emerge --sync This is one step installation: emerge --ask dev-lang/elixir

Install Jekyll on Linux Mint 18

Install jekyll on Linux Mint 18 with the following steps: sudo apt install ruby sudo apt install build-essential sudo apt install ruby-dev sudo gem install jekyll

Install Jekyll on Windows

Open a command prompt with Administrator access Install Chocolatey: @powershell -NoProfile -ExecutionPolicy Bypass -Command "iex ((new-object net.webclient).DownloadString('https://chocolatey.org/install.ps1'))" && SET PATH=%PATH%;%ALLUSERSPROFILE%\chocolatey\bin Close the comm...

What's New in ASP.NET MVC 5

Authentication filters Are a new kind of filter added in ASP.NET MVC 5.0 .That run prior to authorization filters in the ASP.NET MVC pipeline and allow you to specify authentication logic per-action, per-controller, or globally for all controllers. Authentication filters process credentials in th...

Integrity Validated - Symmetric Key - Encryption and Decryption example using Java

Encryption is used to transform data in its orignal format (Eg: The contents of a letter, Credentials part of authorizing a financial transaction) to something that cannot be easily reconstructed by anyone who is not intended to be part of the conversation. Basically encryption is used to preve...

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