Tutorial by Examples: en

Creating Custom Sigils and Documenting

Each x sigil call respective sigil_x definition Defining Custom Sigils defmodule MySigils do #returns the downcasing string if option l is given then returns the list of downcase letters def sigil_l(string,[]), do: String.Casing.downcase(string) def sigil_l(string,[?l]), do: String.Casing...

Elixir Language • Tips and Tricks

Ionic strength

from chempy.electrolytes import ionic_strength ionic_strength({'Fe+3': 0.050, 'ClO4-': 0.150}) == .3 True

Python Language • ChemPy - python package

Chemical kinetics (system of ordinary differential equations)

from chempy import ReactionSystem # The rate constants below are arbitrary rsys = ReactionSystem.from_string("""2 Fe+2 + H2O2 -> 2 Fe+3 + 2 OH-; 42 2 Fe+3 + H2O2 -> 2 Fe+2 + O2 + 2 H+; 17 H+ + OH- -> H2O; 1e10 H2O -> H+ + OH-; 1e-4 Fe+3 + 2 H2O -...

Python Language • ChemPy - python package

Implementation

The other thing about Proxy class, and why it is not so popular, is that it is rather difficult to fathom a problem that exactly needs a dynamic class with a controllable access to its dynamic properties and methods as a most appropriate solution. Every time I tried to use Proxy, I have ended up res...

ActionScript 3 • Using the Proxy Class

Terminology Difference

Relational DatabaseElasticsearchDatabaseIndexTableTypeRow/RecordDocumentColumn Namefield Above table roughly draws an analogy between basic elements of relational database and elasticsearch. Setup Considering Following structure in a relational database: create databse test; use test; crea...

Elasticsearch • Difference Between Relational Databases and Elasticsearch

Usecases where Relational Databases are not suitable

Essence of searching lies in its order. Everyone wants search results to be shown in such a way that best suited results are shown on top. Relational database do not have such capability. Elasticsearch on the other hand shows results on the basis of relevancy by default. Setup Same as used in ...

Elasticsearch • Difference Between Relational Databases and Elasticsearch

Use of Codable with JSONEncoder and JSONDecoder in Swift 4

Let’s Take an Example with Structure of Movie, here we have defined the structure as Codable. So, We can encode and decode it easily. struct Movie: Codable { enum MovieGenere: String, Codable { case horror, skifi, comedy, adventure, animation } var name : String v...

iOS • Codable

Refreshing the IntelliSense cache

When objects are created or modified they are not automatically available for IntelliSense. To make them available to IntelliSense the local cache has to be refreshed. Within an query editor window either press Ctrl + Shift + R or select Edit | IntelliSense | Refresh Local Cache from the menu. Aft...

Microsoft SQL Server • SQL Server Management Studio (SSMS)

Switching the geometry and the surface representation using subroutines in OGL 4.0 GLSL

A simple OGL 4.0 GLSL shader program that shows the use shader subroutines. The program is executed with a phyton script. To run the script, PyOpenGL and NumPy must be installed. The subroutines switch between different geometry generated in the geometry shader and change the surface representatio...

glsl • Getting started with glsl

Authentication In React Native Using Firebase

Replace firebase values with your app api values: import firebase from 'firebase'; componentWillMount() { firebase.initializeApp({ apiKey: "yourAPIKey", authDomain: "authDomainNAme", databaseURL: "yourDomainBaseURL", projectId: "yourProjectID", ...

react-native • Integration with Firebase for Authentication

UIScrollView dynamic content size through Storyboard

While using scrollviews in storyboard it's better to calculate content size according to number of views present in scrollview rather than giving content size programatically with static value. Here are the steps to get content size dynamically. Step 1 : Add Scrollview to view in storyboard and ...

iOS • UIScrollView AutoLayout

Creating a custom Entry control with a MaxLength property

The Xamarin Forms Entry control does not have a MaxLength property. To achieve this you can extend Entry as below, by adding a Bindable MaxLength property. Then you just need to subscribe to the TextChanged event on Entry and validate the length of the Text when this is called: class CustomEntry ...

Xamarin.Forms • Creating custom controls

Get current state

import * as Redux from 'redux'; import {Inject, Injectable} from '@angular/core'; @Injectable() export class exampleService { constructor(@Inject(AppStore) private store: Redux.Store<AppState>) {} getExampleState(){ console.log(this.store.getState().example); } } ...

Angular 2 • angular redux

Image pulling with progress bars, written in Go

Here is an example of image pulling using Go and Docker Engine API and the same progress bars as the ones shown when you run docker pull your_image_name in the CLI. For the purposes of the progress bars are used some ANSI codes. package yourpackage import ( "context" "en...

Docker • Docker Engine API

Setup Token on Header

Set the token on <head> of your default.blade.php. <meta name="csrf-token" content="{{csrf_token()}}"> Add ajaxSetup on the top of your script, that will be accessible to everywhere. This will set headers on each ajax call $.ajaxSetup({ headers: { '...

Laravel • Token Mismatch Error in AJAX

Set token on
tag

Add below function to your <form> tag. This function will generate a hidden field named _token and filled value with the token. {{csrf_field()}} Add csrf_token () function to your hidden _token in the value attribute. This will generate only encrypted string. <input type="hidden&q...

Laravel • Token Mismatch Error in AJAX

Use _token field on Ajax

There are many ways to send _token on AJAX call Get all input field's value within <form> tag using var formData = new FormData($("#cart-add")[0]); Use $("form").serialize(); or $("form").serializeArray(); Add _token manually on data of Ajax. using $('meta[n...

Laravel • Token Mismatch Error in AJAX

General information

First some general information about how arrays behave in Coldfusion as compared to other programming languages. Arrays can have numeric indexes only (if you want to have a string index use structs instead) Arrays begin at index [1] Arrays can have one ore more dimensions

coldfusion • ColdFusion Arrays

Read file from document directory in chunks

I get the file path from document directory and read that file in chunks of 1024 and save (append) to NSMutableData object or you can directly write to socket. // MARK: - Get file data as chunks Methode. func getFileDataInChunks() { let doumentDirectoryPath = NSSearchPathForDirectoriesI...

iOS • FileHandle

Display different content to different roles

The sec:authorize attribute renders its content when the attribute expression is evaluated to true <div sec:authorize="hasRole('ROLE_ADMIN')"> Content for administrators </div> <div sec:authorize="hasRole('ROLE_USER')"> Content for users </div&g...

thymeleaf • Spring Security and Thymeleaf