Tutorial by Examples: el

Return statement inside loop in a function

In this example, function will return as soon as value var has 1 def func(params): for value in params: print ('Got value {}'.format(value)) if value == 1: # Returns from function as soon as value is 1 print (">>>> Got 1") ...

Python Language • Using loops within functions

Use an Applescript as a shell function

You're not limited to single line Applescript code. Here we take the previous two examples and combine them into a single function. #!/bin/bash pageinfo() { osascript -e \ 'tell app "safari" tell the current tab of window 1 return {url & "\n" & ...

applescript • Applescript from the Terminal command line

Generate User model from command line

To generate json user model with username, password_hash, email_id, created_at, updated_at, type mix phoenix.gen.json User users username:string email_id:string password_hash:string timestamps()

phoenix-framework • Ecto models usage in phoenix

Migrations of ecto model

When you run mix phoenix.gen.html or mix phoenix.gen.json from command line, migrations are created in priv -> repo -> migrations in your project folder. To run migrations type mix ecto.migrate. To generate migrations for your project mix ecto.gen migrations <model_name> To generate m...

phoenix-framework • Ecto models usage in phoenix

Linking Electron with Bootstrap

In order to use bootstrap, there are 2 cases. The electron app is connected to internet The electron app is not connected to internet For electron apps that are connected to internet, we can just make use of CDN links for bootstrap and include that in our html files. The problem comes when w...

electron • Using bootstrap in electron

Delegate Can be used as a layer to reduce boilerplate

Consider Kotlin's Null Type system and WeakReference<T>. So let's say we have to save some sort of reference and we wanted to avoid memory leaks, here is where WeakReference comes in. take for example this: class MyMemoryExpensiveClass { companion object { var reference: WeakR...

Kotlin • Delegated properties

Select value with dynamic SQL

Let's say a user wants to select data from different tables. A table is specified by the user. function get_value(p_table_name varchar2, p_id number) return varchar2 is value varchar2(100); begin execute immediate 'select column_value from ' || p_table_name || ...

Oracle Database • Dynamic SQL

Connecting electron app with Nedb

While building electron apps, usually the backend is in separate folder (js files) and front end is in a separate folder (html files). In the backend, in order to use the database, we have to include the nedb package with the require statement as follows. var Datastore = require('nedb'),db = new Da...

electron • Using nedb in electron

Delete in nedb

In order to remove documents in nedb, it's very easy. We just have to use remove function of db object. db.remove({ name: 'bigbounty' }, function (err, numremoved) { // numremoved is the number of documents that are removed. });

electron • Using nedb in electron

Hello World in a SFML Window

Let's write a small program which will open a window, and write "Hello World" on the screen. #include <SFML\Graphics.hpp> #include <cassert> int main() { sf::RenderWindow sfmlWin(sf::VideoMode(600, 360), "Hello World SFML Window"); sf::Font font; /...

sfml • Getting started with sfml

Apply Filter to Image Patches and Set Each Pixel as the Mean of the Result of Each Patch

Many modern Image Processing algorithms use patches are their basic element to work on. For instance one could denoise patches (See BM3D Algorithm). Yet when building the image form the processed patches we have many results for the same pixel. One way to deal with it is taking the average (Empir...

MATLAB Language • Usage of `accumarray()` Function

Recommended ways to execute shell code in Ruby:

Open3.popen3 or Open3.capture3: Open3 actually just uses Ruby's spawn command, but gives you a much better API. Open3.popen3 Popen3 runs in a sub-process and returns stdin, stdout, stderr and wait_thr. require 'open3' stdin, stdout, stderr, wait_thr = Open3.popen3("sleep 5s && ls&q...

Ruby Language • Operating System or Shell commands

Clasic ways to execute shell code in Ruby:

Exec: exec 'echo "hello world"' or exec ('echo "hello world"') The System Command: system 'echo "hello world"' Will output "hello world" in the command window. or system ('echo "hello world"') The system command can return a true if ...

Ruby Language • Operating System or Shell commands

Shopify local development with Theme Kit

Shopify themes can also be developed locally. Follow the steps below to setup local development environment: Install Shopify Theme Kit Get API Access Use a new theme or Configure an existing theme with theme kit Explanation of the above steps are as follows: Install Shopify Theme Kit A...

Shopify • Getting started with Shopify

Get help on available mix tasks

To list available mix tasks use: mix help To get help on a specific task use mix help task e.g.: mix help cmd

Elixir Language • Mix

HTML text in UILabel

NSString * htmlString = @"<html><body> <b> Example bold text in HTML </b> </body></html>"; NSAttributedString * attrStr = [[NSAttributedString alloc] initWithData:[htmlString dataUsingEncoding:NSUnicodeStringEncoding] options:@{ NSDocumentTypeDocumentAt...

iOS • attributedText in UILabel

Set different property to text in single UILabel

The first step you need to preform is to create a NSMutableAttributedString object. The reason we create a NSMutableAttributedString instead of NSAttributedString is because it enables us to append string to it. NSString *fullStr = @"Hello World!"; NSMutableAttributedString *attString =[...

iOS • attributedText in UILabel

Spring Boot and Spring Data Elasticsearch integration

In this example we are going to implement spring-data-elasticsearch project to store POJO in elasticsearch. We will see a sample maven project which does the followings: Insert a Greeting(id, username, message) item on elasticsearch. Get All Greeting items which have been inserted. Update a Gr...

spring-boot • Spring Boot + Spring Data Elasticsearch

Spring boot and spring data elasticsearch integration

In this example we are going to see a maven based spring boot application which integrates spring-data-elasticsearch. Here, we will do the followings and see the respective code segments. Insert a Greeting(id, username, message) item on elasticsearch. Get all items from elasticsearch Update a s...

spring-boot • Spring Boot + Spring Data Elasticsearch

Delete local branches that have been deleted on the remote

To remote tracking between local and deleted remote branches use git fetch -p you can then use git branch -vv to see which branches are no longer being tracked. Branches that are no longer being tracked will be in the form below, containing 'gone' branch 12345e6 [origin/bran...

Git • Tidying up your local and remote repository