Tutorial by Examples: s

Pitfall - Over-use of primitive wrapper types is inefficient

Consider these two pieces of code: int a = 1000; int b = a + 1; and Integer a = 1000; Integer b = a + 1; Question: Which version is more efficient? Answer: The two versions look almost the identical, but the first version is a lot more efficient than the second one. The second version is...

Java Language • Java Pitfalls - Performance Issues

Get camera and microphone permission and display preview on webpage

In order to begin using WebRTC you need to get camera and microphone permission.For that you need following things: adapter.js, you can get it from here A html webpage with a video tag and little bit of js code The adapter.js is a JavaScript shim for WebRTC, maintained by Google with help fro...

webrtc • WebRTC simple examples

Group a collection of test classes in a test suite

You can organize the execution of your instrumented unit tests defining a Suite. /** * Runs all unit tests. */ @RunWith(Suite.class) @Suite.SuiteClasses({MyTest1.class , MyTest2.class, MyTest3.class}) public class AndroidTestSuite {} Then in AndroidStudio you can run...

Android • Testing UI with Espresso

Installation

Tableau offers a 2 week free trial for all of their licensed products. Tableau also offers licenses to Students for free here and nearly free Desktop licenses for non-profit organizations here. To get started with a free trial, navigate to Tableau Products to see a list of their offerings which inc...

tableau • Getting started with tableau

Remove event listener

d3.js doesn't have a .off() method to detatch existent event listeners. In order to remove an event handler, you have to set it to null: d3.select('span').on('click', null)

d3.js • On Events

Simple D3 Chart: Hello World!

Paste this code into an empty HTML file and run it in your browser. <!DOCTYPE html> <body> <script src="https://d3js.org/d3.v4.js"></script>  <script> //This code will visualize a data set as a simple scatt...

d3.js • Getting started with d3.js

When-statement with enums

when can be used to match enum values: enum class Day { Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday } fun doOnDay(day: Day) { when(day) { Day.Sunday -> // Do something Day.Monday, Day.Tuesday -> // Do oth...

Kotlin • Conditional Statements

Setting Minimum-Maximum Date

You can set the minimum and the maximum date that UIDatePicker can show. Minimum date [datePicker setMinimumDate:[NSDate date]]; Maximum date [datePicker setMaximumDate:[NSDate date]];

iOS • UIDatePicker

Modes

UIDatePicker has various picker modes. enum UIDatePickerMode : Int { case Time case Date case DateAndTime case CountDownTimer } Time - The date picker displays hours, minutes, and (optionally) an AM/PM designation. Date - The date picker displays months, days of the mon...

iOS • UIDatePicker

Setting minute interval

You can change property minuteInterval to set the interval displayed by the minutes wheel. The default value is 1, the maximum value is 30. let datePicker = UIDatePicker(frame: CGRect(x: 0, y: 0, width: 320, height: 200) datePicker.minuteInterval = 15

iOS • UIDatePicker

Updating the Help System

3.0 Beginning with PowerShell 3.0, you can download and update the offline help documentation using a single cmdlet. Update-Help To update help on multiple computers (or computers not connected to the internet). Run the following on a computer with the help files Save-Help -DestinationPath ...