Tutorial by Examples: e

cleanUpOldData

public static void cleanUpOldData(AmazonDynamoDB amazonDynamoDB, String dynamoDBTablesPrefix, String tableName, String dateRangeField, String dateHashKey, String dateIndex, Class clazz) { log.info(String.format("Cleaning old data from table: %s", tab...

amazon-dynamodb • Dynamodb delete data over time

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

Using numpy.save and numpy.load

np.save and np.load provide a easy to use framework for saving and loading of arbitrary sized numpy arrays: import numpy as np a = np.random.randint(10,size=(3,3)) np.save('arr', a) a2 = np.load('arr.npy') print a2

numpy • Saving and loading of Arrays

Simple Symmetric File Encryption

The following code sample demonstrates a quick and easy means of encrypting and decrypting files using the AES symmetric encryption algorithm. The code randomly generates the Salt and Initialization Vectors each time a file is encrypted, meaning that encrypting the same file with the same password ...

C# Language • Cryptography (System.Security.Cryptography)

Web notification

First, you will need to install Push.js module. $ npm install push.js --save Or import it to your front-end app through CDN <script src="./push.min.js"></script>  After you are done with that, you should be good to go. This is how it should look l...

Node.js • Push notifications

Apple

Keep in mind that this will not work on Apple devices (I didnt test them all), but if you want to make push notifications check OneSignal plugin.

Node.js • Push notifications

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

DRF View

class UserRegistration(APIView): def post(self, request, *args, **kwargs): serializer = UserRegistrationSerializer(data=request.data) serializer.is_valid(raise_exception=True) serializer.save() return Response(serializer.to_representation(instance=serializer....

django-rest-framework • Using django-rest-framework with AngularJS as front-end framework.

Angular Request

$http.post("\<domain\>/user-registration/", {username: username, password: password}) .then(function (data) { // Do success actions here });

django-rest-framework • Using django-rest-framework with AngularJS as front-end framework.

API documentation

Use Spring REST Docs to document your services. It's a powerful framework which makes sure that the Service logic is always inline with the documentation. In order to do so, you would have to write integration tests for your services. If there is any mismatch in the documentation & service beha...

microservices • Getting started with microservices

Sample for API documentation

Use Spring REST Docs to document your services. It's a powerful framework which makes sure that the Service logic is always inline with the documentation. In order to do so, you would have to write integration tests for your services. If there is any mismatch in the documentation & service beha...

microservices • Getting started with microservices

Installation or Setup

Detailed instructions on getting symfony-forms set up or installed.

symfony-forms • Getting started with symfony-forms

Simple example

Encoded URL http%3A%2F%2Fwww.foo.com%2Findex.php%3Fid%3Dqwerty Use this command to decode the URL echo "http%3A%2F%2Fwww.foo.com%2Findex.php%3Fid%3Dqwerty" | sed -e "s/%$[0-9A-F][0-9A-F]$/\\\\\x\1/g" | xargs -0 echo -e Decoded URL (result of command) http://www.foo...

Bash • Decoding URL

Whitespace handling

To remove whitespace (spaces, tabs, newlines…) between HTML tags use spaceless tag: {% spaceless %} <div> <span>foo bar </span> </div> {% endspaceless %} {# produces output <div><strong>foo bar </strong></div> #} If you need ...

twig • Basic template syntax

Page, DOM and Browser loading

This is an example to explain the variations of load events. onload event <body onload="someFunction()"> <img src="image1" /> <img src="image2" /> </body> <script> function someFunction() { console.log("Hi! I am l...

JavaScript • Events

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

from a public repository using the command line and renaming file

This example grabs the Node.gitignore file from GitHub's gitignore repository, downloads it to your current working directory and renames it to .gitignore - all very typical actions for someone starting a new node.js project. $ curl http://github.com/github/gitignore/raw/master/Node.gitignore -o .g...

github • download single file from GitHub repository

find the url of the file you want to download

navigate to the desired file in a repository click the 'raw' button copy the url from the address bar See the following example from GitHub's gitignore repository: http://github.com/github/gitignore/raw/master/Node.gitignore You can quickly recognize a url that will work to download an indiv...

github • download single file from GitHub repository

Using printf to decode a string

#!bin/bash $ string='Question%20-%20%22how%20do%20I%20decode%20a%20percent%20encoded%20string%3F%22%0AAnswer%20%20%20-%20Use%20printf%20%3A)' $ printf '%b\n' "${string//%/\\x}" # the result Question - "how do I decode a percent encoded string?" Answer - Use printf ...

Bash • Decoding URL

Installation or Setup

Detailed instructions on getting metal set up or installed.

metal • Getting started with metal