Tutorial by Examples: er

mView.afterMeasured { // inside this block the view is completely drawn // you can get view's height/width, it.height / it.width } Under the hood inline fun View.afterMeasured(crossinline f: View.() -> Unit) { viewTreeObserver.addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlob...

Automatic routing for the DRF, can be achieved for the ViewSet classes. Assume that the ViewSet class goes by the name of MyViewSet for this example. To generate the routing of MyViewSet, the SimpleRouter will be utilized. On myapp/urls.py: from rest_framework import routers router = ...

Creates a scheduled task that executes immediately, then on start up to run C:\myscript.ps1 as SYSTEM $ScheduledTaskPrincipal = New-ScheduledTaskPrincipal -UserId "SYSTEM" -LogonType ServiceAccount $ScheduledTaskTrigger1 = New-ScheduledTaskTrigger -AtStartup $ScheduledTaskTrigger2 = New...

Moving Average of last 30 Items sold SELECT value_column1, ( SELECT AVG(value_column1) AS moving_average FROM Table1 T2 WHERE ( SELECT COUNT(*) FROM Table1 T3 WHERE date_column1 BETWEEN T2.date_column1...

To make the use of the adapter pattern and the kind of situation when it may be applied more imaginable, a small, simple and very concrete example is given here. There will be no code in here, just UML and a description of the example situation and its problem. Admittedly, the UML content is writte...

Note: examples written for PowerShell 5.1 You can create instances of Generic Classes #Nullable System.DateTime [Nullable[datetime]]$nullableDate = Get-Date -Year 2012 $nullableDate $nullableDate.GetType().FullName $nullableDate = $null $nullableDate #Normal System.DateTime [datetime]$aDa...

Let's assume you got an html after selecting with soup.find('div', class_='base class'): from bs4 import BeautifulSoup soup = BeautifulSoup(SomePage, 'lxml') html = soup.find('div', class_='base class') print(html) <div class="base class"> <div>Sample text 1</div...

Using transform functions that return sub-calculations per group In the previous example, we had one result per client. However, functions returning different values for the group can also be applied. # Create a dummy dataframe orders_df = pd.DataFrame() orders_df['customer_id'] = [1,1,1,1,1,2,...

[-1, 0, 2, 4, 7, 9].where((x) => x > 2) --> [4, 7, 9]

Swift: mapView.showAnnotations(mapView.annotations, animated: true) Objective-C: [mapView showAnnotations:mapView.annotations animated:YES]; Demo:

#include "cuda_runtime.h" #include "device_launch_parameters.h" #include "cuda.h" #include <device_functions.h> #include <cuda_runtime_api.h> #include<stdio.h> #include <cmath> #include<stdlib.h> #include<iostream> #include...

Let's consider situation when you parse number of pages and you want to collect value from element that's optional (can be presented on one page and can be absent on another) for a paticular page. Moreover the element itself, for example, is the most ordinary element on page, in other words no spec...

The npm scripts are commands that npm will run for you when called with the proper arguments. The power and sense of this is to NOT install the npm packages globally poluting your environment. The difference between pre-recognized and custom scripts relies on the run word between the tags, custom s...

// this sets the configuration option for your environment ini_set('display_errors', '1'); //-1 will allow all errors to be reported error_reporting(-1);

Using Line Numbers ... and documenting them in case of error ("The importance of seeing Erl") Detecting which line raises an error is a substantial part of any debugging and narrows the search for the cause. To document identified error lines with a short description completes a successf...

Edit crontab using command crontab -e Add this line to the end of file. * * * * * /fullpath/mycron Exit Verify by command crontab -l

override func numberOfSections(in tableView: UITableView) -> Int { // You need to return minimum one to show the cell inside the tableview return 1 } override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { // return the number of rows i...

route/index.js import About from '@/components/About' const router = new Router({ routes: [ { path: '/', name: 'home', component: {template: "<div>Home</div>"} }, { path: '/about', component: About ...