Tutorial by Examples: is

React Native - ListView with Firebase

This is what I do when I'm working with Firebase and I want to use ListView. Use a parent component to retrieve the data from Firebase (Posts.js): Posts.js import PostsList from './PostsList'; class Posts extends Component{ constructor(props) { super(props); this.state =...

react-native • Integration with Firebase for Authentication

Change a file's permissions

> chmod 644 example.txt > ls -l example.txt -rw-r--r-- 1 owner ogroup 57 Jul 3 10:13 example.txt The above command changes the file permissions to allow the file owner to read and write to a file. It also allows users in the owner's group and other users in the system to read the file....

unix • Permissions

List all databases

show dbs or db.adminCommand('listDatabases') or db.getMongo().getDBNames()

MongoDB • Getting database information

List all collections in database

show collections or show tables or db.getCollectionNames()

MongoDB • Getting database information

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...

sharepoint • REST Services

Custom Listview comprises of rows that are designed as per the users needs.

For the layout above your customrow.axml file is as shown below <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_heigh...

Xamarin.Android • Custom ListView

What is Data processing latency?

When a hit is sent to Google Analytics the data must be processed. Processing latency is 24-48 hours. This means that it can take time before you will see data under standard reports (Not real-time) any data that you do see may not be correct as it has probably not completed processing. Standard a...

google-analytics • Data processing latency

with_items - simple list

A with_items loop in ansible can be used to easily loop over values. - name: Add lines to this file lineinfile: dest=/etc/file line={{ item }} state=present with_items: - Line 1 - Line 2 - Line 3

ansible • Ansible: Looping

with_items - predefined list

You can also loop over a variable list. From vars: favorite_snacks: - hotdog - ice cream - chips and then the loop: - name: create directories for storing my snacks file: path=/etc/snacks/{{ item }} state=directory with_items: '{{ favorite_snacks }}' If you are using Ansible ...

ansible • Ansible: Looping

Decoupling ErrorHandlerAttribute registering from the service implementation

To decouple and reuse the same error logging code for all your services you need two boilerplate classes and tuck them away in a library somewhere. ErrorhandlerAttribute implementing IServiceBehavior. FaultErrorhandler implementing IErrorhandler which logs all the exceptions. [AttributeUsage(Attr...

wcf • Handling exceptions

Detecting missing values with np.nan

If you want to detect missings with df=pd.DataFrame({'col':[1,np.nan]}) df==np.nan you will get the following result: col 0 False 1 False This is because comparing missing value to anything results in a False - instead of this you should use df=pd.DataFrame({'col':[1,np.nan]}) ...

pandas • Gotchas of pandas

Different ways to Select from DropDown list

Below is and HTML page <html> <head> <title>Select Example by Index value</title> </head> <body> <select name="Travel"><option value="0" selected> Please select</option> <option value="1">Car</option&...

selenium-webdriver • Select Class

Saving a buffer in a non-existent dir

:!mkdir -p %:h to create the missing directories, then :w

vim • Saving

List Controls

ASP.NET provides the following controls Drop-down list List box Radio button list Check box list Bulleted list These control let a user choose from one or more items from the list. List boxes and drop-down lists contain one or more list items. These lists can be loaded either by code or b...

ASP.NET • ASP.NET - Basic Controls

Radio Button list and Check Box list

A radio button list presents a list of mutually exclusive options. A check box list presents a list of independent options. These controls contain a collection of ListItem objects that could be referred to through the Items property of the control. Basic syntax of radio button list: <asp:RadioB...

ASP.NET • ASP.NET - Basic Controls

Bulleted lists and Numbered lists

The bulleted list control creates bulleted lists or numbered lists. These controls contain a collection of ListItem objects that could be referred to through the Items property of the control. Basic syntax of a bulleted list: <asp:BulletedList ID="BulletedList1" runat="server&quo...

ASP.NET • ASP.NET - Basic Controls

Sensitivity lists and wait statements

A process with a sensitivity list cannot also contain wait statements. It is equivalent to the same process, without a sensitivity list and with one more last statement which is: wait on <sensitivity_list>; Example: process(clock, reset) begin if reset = '1' then q &l...

vhdl • Wait

Retrieve an ID of newly created item in SharePoint list

This example shows how to retrieve an ID of a newly created item using SharePoint REST API. Note : listName - This variable contains name of you list. newItemBody - This will be your request body for adding new item in list. e.g. var newItemBody = { __metadata: { 'type': 'SP.Data.MyListNameIte...

sharepoint • REST Services

Listing all databases

r.connect({host: 'localhost', port: 28015}) .then((conn) => { return r.dbList().run(conn); }).then((result) => { // Prints out list of databases on the RethinkDB instance console.log(result); });

rethinkdb • Getting started with Node

Decoding a list of records

The following code can be found in a demo here: https://ellie-app.com/mbFwJT9jD3/0 import Html exposing (..) import Json.Decode exposing (Decoder) payload = """ [{ "id": 0, "name": "Adam Carter", "work": "Uni...

Elm Language • Json.Decode