List in scheme are nothing else than a series of pairs nested in each other in the cdr of a cons. And the last cdr of a proper list is the empty list '().
To create the list (1 2 3 4), we'd have something like this:
(cons 4 '())
> (4)
(cons 3 (cons 4 '()))
> (3 4)
(cons 2 (cons 3 (cons 4...
Here’s an example vector asset which we’re actually using in AppCompat:
res/drawable/ic_search.xml
<vector xmlns:android="..."
android:width="24dp"
android:height="24dp"
android:viewportWidth="24.0"
android:viewportHeig...
Here is a simple VectorDrawable in this vectordrawable.xml file.
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:height="64dp"
android:width="64dp"
android:viewportHeight="600"
android:viewportWidth="...
This is for those moving to data.table >= 1.9.8
You have a data set of pet owners and names, but you suspect some repeated data has been captured.
library(data.table)
DT <- data.table(pet = c("dog","dog","cat","dog"),
owner = c("...
Dependenct Injection Intro
An application is composed of many objects that collaborate with each other. Objects usually depend on other objects to perform some task. When an object is responsible for referencing its own dependencies it leads to a highly coupled, hard-to-test and hard-to-change code...
Let's say we have a form like the one below. We want to send the data to our webserver via AJAX and from there to a script running on an external server.
So we have normal inputs, a multi-select field and a file dropzone where we can upload multiple files.
Assuming the AJAX POST request was succ...
If a view is created WITH SCHEMABINDING, the underlying table(s) can't be dropped or modified in such a way that they would break the view. For example, a table column referenced in a view can't be removed.
CREATE VIEW dbo.PersonsView
WITH SCHEMABINDING
AS
SELECT
name,
address
FROM d...
//create a new ExcelPackage
using (ExcelPackage excelPackage = new ExcelPackage())
{
//create the WorkSheet
ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.Add("Sheet 1");
//add some text to cell A1
worksheet.Cells["A1"].Value = "My second...
The first to thing to have: a model that contains a has_many relation with another model.
class Project < ApplicationRecord
has_many :todos
end
class Todo < ApplicationRecord
belongs_to :project
end
In ProjectsController:
class ProjectsController < ApplicationController
d...
//Using File.WriteAllBytes
using (ExcelPackage excelPackage = new ExcelPackage())
{
//create a new Worksheet
ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.Add("Sheet 1");
//add some text to cell A1
worksheet.Cells["A1"].Value = "My fourt...
The easiest way to record a macro is the button in the lower left corner of Excel looks like this:
When you click on this you will get a pop-up asking you to name the Macro and decide if you want to have a shortcut key. Also, asks where to store the macro and for a description. You can choose any ...
IMPORTANT This is just an example code, do not use in production.
In order to download an header chain we have to send a getHeaders message.
In this example we will require as much as possible headers after the 40000th one.The peer will respond with batch of 2000 headers so, we have to take the la...
We can statically bootstrap an application by taking the plain ES5 Javascript output of the generated factory classes. Then we can use that output to bootstrap the application:
import { platformBrowser } from '@angular/platform-browser';
import { AppModuleNgFactory } from './main.ngfactory';
//...
You can create new commands via
php artisan make:command [commandName]
So this will create [commandName] command class inside app/Console/Commands directory.
inside this class you will find protected $signature and protected $description variables, it represents name and discription of your comma...
instance methods use an instance of a class.
@interface MyTestClass : NSObject
- (void)testInstanceMethod;
@end
They could then be used like so:
MyTestClass *object = [[MyTestClass alloc] init];
[object testInstanceMethod];
Class method can be used with just the class name.
@inte...
Google Drive (Standalone) Web App to automatically download (Poll) files from Drive to user's local PC (Download Folder).
DriveApp provides mechanisms for searching and downloading files. However the download mechanism has some serious limitations due to the client/server architecture Google Apps ...
Sublime Terminal. Terminal allows use to open your favourite terminal right at the current file or project location you are currently working on in Sublime Text, with handy keyboard shortcuts. It is available through Package Control.
SideBar Enhancements. This plugin adds additional functio...
