Tutorial by Examples: s

Using HTTPS

The minimal setup for an HTTPS server in Node.js would be something like this : const https = require('https'); const fs = require('fs'); const httpsOptions = { key: fs.readFileSync('path/to/server-key.pem'), cert: fs.readFileSync('path/to/server-crt.pem') }; const app = function ...

Node.js • Securing Node.js applications

Setting up an HTTPS server

Once you have node.js installed on your system, just follow the procedure below to get a basic web server running with support for both HTTP and HTTPS! Step 1 : Build a Certificate Authority create the folder where you want to store your key & certificate : mkdir conf go to tha...

Node.js • Securing Node.js applications

CSS import

Import external style sheet. Working jsBin <!DOCTYPE html> <html> <head> <base href="https://polygit.org/polymer+:master/iron-data-table+Saulis+:master/components/"> <link rel="import" href="polymer/polymer.html"> ...

polymer • iron-data-table

Row details

Expand row details to display additional data. Working jsBin <!DOCTYPE html> <html> <head> <base href="https://polygit.org/polymer+:master/iron-data-table+Saulis+:master/components/"> <link rel="import" href="polymer/polymer.html&...

polymer • iron-data-table

Edit row details

Working jsBin <!DOCTYPE html> <html> <head> <base href="https://polygit.org/polymer+:master/iron-data-table+Saulis+:master/components/"> <link rel="import" href="polymer/polymer.html"> <script src="webcom...

polymer • iron-data-table

Edit row details using sub-element

This example uses a separate element to edit bound data to the row-detail template. Working jsBin <!DOCTYPE html> <html> <head> <base href="https://polygit.org/polymer+:master/iron-data-table+Saulis+:master/components/"> <link rel="import&q...

polymer • iron-data-table

Select row, prevent deselection

Default behavior is to de-select row when clicked twice. In some use cases, you might want to disable this de-selecting behavior. Note table.deselectItem(item) method will imperatively deselect an item. This works with both item or index (when using items array) as an argument. Working jsBin &lt...

polymer • iron-data-table

Accessing query results

Once you have a query, you can do more with it than just iterating the results in a for loop. Setup: from datetime import date class User(Base): __tablename__ = 'users' id = Column(Integer, primary_key=True) name = Column(Text, nullable=False) birthday = Column(Date) # ...

sqlalchemy • The ORM

Reading commands from a script file

Octave commands can be saved in a file and evaluated by loading the file using source. For instance, let hello.m be the text file containing two lines (the first line is a comment) # my first Octave program disp('Hello, World!') If you type source hello.m at an Octave command prompt you will g...

octave • Getting started with octave

Matrices

Create a 2x3 matrix. Each row is a comma-separated list of elements. Rows are separated by a semicolon. A = [1, 2, 3; 4, 5, 6] # A = # # 1 2 3 # 4 5 6 Sum of two matrices B = [1, 1, 1; 1, 1, 1] # B = # # 1 1 1 # 1 1 1 A+B # ans = # # 2 3 4 # ...

octave • Getting started with octave

Simple Dockerfile

# Base image FROM python:2.7-alpine # Metadata MAINTAINER John Doe <[email protected]> # System-level dependencies RUN apk add --update \ ca-certificates \ && update-ca-certificates \ && rm -rf /var/cache/apk/* # App dependencies COPY requirements....

Docker • Dockerfile contents ordering

Alternative async tracking snippet

While the JavaScript tracking snippet described above ensures the script will be loaded and executed asynchronously on all browsers, it has the disadvantage of not allowing modern browsers to preload the script. The alternative async tracking snippet below adds support for preloading, which will pr...

google-analytics • Getting started with google-analytics

Using Plugins

Plugins are scripts that enhance the functionality of analytics.js to aid in measuring user interaction. Plugins are typically specific to a set of features that may not be required by all Google Analytics users, such as ecommerce or cross-domain tracking, and are therefore not included in analytics...

google-analytics • Getting started with google-analytics

What data does the tracking snippet capture?

When you add either of these tracking snippets to your website, you send a pageview for each page your users visit. Google Analytics processes this data and can infer a great deal of information including: The total time a user spends on your site. The time a user spends on each page and in what o...

google-analytics • Getting started with google-analytics

using GNU coreutils

So the GNU coreutils should be avaialable on all linux based systems (please correct me if I am wrong here). If you do not know what system you are using you may not be able to directly jump to one of the examples above, hence this may be your first port of call. `$ uname -a On my system this giv...

GNU/Linux • Detecting Linux distribution name and version

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

Setup Codecommit for git command line

AWS Codecommit can be used as storage for private GIT repositories. The setup involves a few steps, assuming you have a valid AWS account already. Sign up for AWS Codecommit. Currently only region us-east-1 is available. Create a IAM user who will have access to the repositories, eg codecommit-u...

aws-cli • aws-codecommit for local git

Use SourceTree with AWS Codecommit

Atlassian SourceTree is a visual tool for Mac and Windows to manage source code repositories. This can be used with Codecommit as a remote repository but need to add an extra configuration option to the local repository in SourceTree to be able to connect with codecommit. First, setup Codecommit fo...

aws-cli • aws-codecommit for local git

An example of an anonymous block

DECLARE -- declare a variable message varchar2(20); BEGIN -- assign value to variable message := 'HELLO WORLD'; -- print message to screen DBMS_OUTPUT.PUT_LINE(message); END; /

Oracle Database • Anonymous PL/SQL Block

Install SBT on Linux

Full instructions can be found here. Install the JDK. Set the Java Environment variable. export JAVA_HOME=/usr/local/java/jdk1.8.0_102 echo $JAVA_HOME /usr/local/java/jdk1.8.0_102 export PATH=$PATH:$JAVA_HOME/bin/ echo $PATH ...:/usr/local/java/jdk1.8.0_102/bin/ Install Scala....

sbt • Getting started with sbt