Tutorial by Examples: le

Docs: lifecycle callbacks, ready. class MyElement extends Polymer.Element { constructor() { super(); /* ... */ } ready() { super.ready(); /* ... */ } connectedCallback() { super.connectedCallback(); /* ... */ } disconnectedCallback() { super.disconnectedCallback(); /* ... */ } attribut...

\documentclass[12pt]{article} \usepackage{titleps} \usepackage{fancyhdr} \usepackage{graphicx} \usepackage{lipsum} % for dummy text \pagestyle{myheadings} \pagestyle{fancy} \fancyhf{} \setlength{\headheight}{30pt} \renewcommand{\headrulewidth}{4pt} \renewcommand{\footrulewidth}{2pt...

You can make function passed to test() method async - then you can use await keyword. Your test will wait until Promises resolve and testing asynchronous code becomes easier and more readable. In the following example call that returns a Promise is changeset.validate(). Please notice also wrapping s...

using Newtonsoft.Json.Linq; using System.Collections.Generic; public class JsonFieldsCollector { private readonly Dictionary<string, JValue> fields; public JsonFieldsCollector(JToken token) { fields = new Dictionary<string, JValue>(); CollectFields...

Let's say Joe owns a website that allows you to log on, view puppy videos, and save them to your account. Whenever a user searches on that website, they are redirected to https://example.com/search?q=brown+puppies. If a user's search doesn't match anything, than they see a message along the lines ...

If you don't think that malicious scripts can harm your site, you are wrong. Here is a list of what a malicious script could do: Remove itself from the DOM so that it can't be traced Steal users' session cookies and enable the script author to log in as and impersonate them Show a fake "Yo...

public class Equatable { public string field1; public override bool Equals(object obj) { if (ReferenceEquals(null, obj)) return false; if (ReferenceEquals(this, obj)) return true; var type = obj.GetType(); if (GetType() != type) re...

The tokio-signal crate provides a tokio-based solution for handling signals. It's still in it's early stages though. extern crate futures; extern crate tokio_core; extern crate tokio_signal; use futures::{Future, Stream}; use tokio_core::reactor::Core use tokio_signal::unix::{self as unix_si...

A simple example would be for a library management application; you would have 2 models, for example, student and book in models.py: from django.db import models class student(models.Model): roll_no = models.IntegerField(primary_key=True) first_name = models.CharField(max_length=30) ...

import pip command = 'install' parameter = 'selenium' second_param = 'numpy' # You can give as many package names as needed switch = '--upgrade' pip.main([command, parameter, second_param, switch]) Only needed parameters are obligatory, so both pip.main(['freeze']) and pip.main(['freeze'...

Interfacing of DS18B20 with Raspberry pi Connection of DS18B20 with Raspberry pi You can see there are three terminal Vcc Gnd Data (One wire protocol) R1 is 4.7k ohm resistance for pulling up the voltage level Vcc should be connected to any of the 5v or 3.3v pins of Raspberry pi (PI...

Let's say that whenever someone visits a profile page in Bob's website, the following URL is fetched: https://example.com/api/users/1234/profiledata.json With a response like this: { "name": "Bob", "description": "Likes pie & security holes.&quot...

custom stuff

Deleting rows is slow, specially when looping through cells and deleting rows, one by one A different approach is using an AutoFilter to hide the rows to be deleted Copy the visible range and Paste it into a new WorkSheet Remove the initial sheet entirely With this method, th...

The procedures bellow will temporarily disable all Excel features at WorkBook and WorkSheet level FastWB() is a toggle that accepts On or Off flags FastWS() accepts an Optional WorkSheet object, or none If the ws parameter is missing it will turn all features on and off for all WorkSh...

Require is a statement that Node interprets as, in some sense, a getter function. For example, say you have a file named analysis.js, and the inside of your file looks like this, function analyzeWeather(weather_data) { console.log('Weather information for ' + weather_data.time + ': '); consol...

We have simple module available in npm for goggle authetication name passport-google-oauth20 Consider the following example In this example have created a folder namely config having the passport.js and google.js file in the root directory. In your app.js include the following var express = requ...

Code example : Now Start with Creating the Pagination Controller public with sharing class Pagination { } i am going to show all the contacts in the form of pagination and there should be one checkbox for each contact to selected or deselect contact to perform delete operation on contacts. ...

| Name | Phone | Age | |-------+-------+-----| | Peter | 1234 | 17 | | Anna | 4321 | 25 | To add a Table in org-mode, simply surround your columns with a bar (|) | column1 | column2 | this column is wider | When you press Return from inside a column, org-mode will automatically creat...

You can read all items either from any config file or type it inline. Considering if its saved in Config File // Read all list items from config file string[] countryDV = ConfigurationManager.AppSettings["countryDV"].Split(',').Select(s => s.Trim().ToUpper()).ToArray(); int DVRowLim...