Tutorial by Examples: ble

let in Kotlin creates a local binding from the object it was called upon. Example: val str = "foo" str.let { println(it) // it } This will print "foo" and will return Unit. The difference between let and also is that you can return any value from a let block. also ...

To enable disk persistence you should enable the flag persistenceEnabled in the FirebaseDatabaseInstance object of your application: Android FirebaseDatabase.getInstance().setPersistenceEnabled(true); iOS Database.database().isPersistenceEnabled = true //Swift [FIRDatabase database].persisten...

For rendering multiple props or variables we can use ``. render() { let firstName = 'test'; let lastName = 'name'; return ( <View style={styles.container}> <Text>{`${firstName} ${lastName}` } </Text> </View> ); } Output: te...

This is a weird approach most of the people don't know this even exist. CREATE TABLE AliasNameDemo(id INT,firstname VARCHAR(20),lastname VARCHAR(20)) INSERT INTO AliasNameDemo VALUES (1,'MyFirstName','MyLastName') SELECT * FROM (SELECT firstname + ' ' + lastname FROM A...

1. For Loop: CountriesName = ["India", "Canada", "America", "Iraq"] for country in CountriesName puts country end 2. Each Iterator: Same set of work can be done with each loop which we did with for loop. CountriesName = ["India", "C...

The ObservableObject class contains some helpful methods to help with the MVVM pattern. The RaisePropertyChanged provides a compile safe method to raise property changed events. It can be called with RaisePropertyChanged(() => MyProperty); The Set method can be used in the property setter t...

Tables are most easily included with the DT package, which is an R interface to the JavaScript library DataTables. library(shiny) library(DT) ui <- fluidPage( dataTableOutput('myTable') ) server <- function(input, output, session){ output$myTable <- renderDataTable({ dat...

Sometimes the download takes longer than the cell is being displayed. In this case it can happen, that the downloaded image is shown in the wrong cell. To fix this we can not use the UIImageView Extension. We still will be using Alamofire however we will use the completion handler to display the im...

var myVariable = "This is a variable!"; This is an example of defining variables. This variable is called a "string" because it has ASCII characters (A-Z, 0-9, !@#$, etc.)

var number1 = 5; number1 = 3; Here, we defined a number called "number1" which was equal to 5. However, on the second line, we changed the value to 3. To show the value of a variable, we log it to the console or use window.alert(): console.log(number1); // 3 window.alert(number1); //...

var myInteger = 12; // 32-bit number (from -2,147,483,648 to 2,147,483,647) var myLong = 9310141419482; // 64-bit number (from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807) var myFloat = 5.5; // 32-bit floating-point number (decimal) var myDouble = 9310141419482.22; // 64-bit floating-...

Let's first brush up with what are the Instance Variables: They behave more like properties for an object. They are initialized on an object creation. Instance variables are accessible through instance methods. Per Object has per instance variables. Instance Variables are not shared between object...

This example will demonstrate the searchable select box in MVC. it uses Ajax to get all records from database as user types the new character. I'll consider Country and its City example to illustrate the functionality of Searchable dropdown box. Code behind is c# with MVC, but its easy to grasp wh...

shared.service.ts: import { Injectable } from '@angular/core'; import { Headers, Http } from '@angular/http'; import 'rxjs/add/operator/toPromise'; import { Observable } from 'rxjs/Observable'; import { Observable } from 'rxjs/Rx'; import {Subject} from 'rxjs/Subject'; @Injectable(...

Grouping with the data.table package is done using the syntax dt[i, j, by] Which can be read out loud as: "Take dt, subset rows using i, then calculate j, grouped by by." Within the dt statement, multiple calculations or groups should be put in a list. Since an alias for list() is .(), bo...

data.service.ts: import { Injectable } from '@angular/core'; import { Http } from '@angular/http'; import 'rxjs/add/operator/map'; @Injectable() export class DataService { constructor(private http: Http) { } fetchData(){ return this.http.get('https://dinstruct-d4b62.firebaseio....

Step 1: Make a design of GridView for displaying your data (HTML Code): <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false"> <Columns> <asp:TemplateField HeaderText="ID"> <ItemTemplate> ...

Design of Nested-GridView (HTML Code): <asp:GridView ID="gvParent" runat="server" AutoGenerateColumns="false" OnRowDataBound="gvParent_RowDataBound"> <Columns> <asp:TemplateField HeaderText="Parent Column"> ...

PSR-8 is a spoof PSR (currently in Draft) proposed by Larry Garfield as an April Fools joke on 1 April 2014. The draft outlines how to define an interface to make an object Huggable. Excert from the code outline: <?php namespace Psr\Hug; /** * Defines a huggable object. * * A hugga...

In order to view tables in a database, use the .tables command. Example: sqlite> .tables table1 table2 table3 table4 table5