Alex Tyler

Alex Tyler

1591319921

How to Use Docker environment variables at JavaScript runtime

One of the greatest benefits provided by Docker is portability.

We can take the same image and run it in a number of different ways, and different places — one of the features that enable this portability is the ability to configure environment variables when launching a container, i.e. at runtime.

#docker #linux #javascript

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How to Use Docker environment variables at JavaScript runtime
Alex Tyler

Alex Tyler

1591319921

How to Use Docker environment variables at JavaScript runtime

One of the greatest benefits provided by Docker is portability.

We can take the same image and run it in a number of different ways, and different places — one of the features that enable this portability is the ability to configure environment variables when launching a container, i.e. at runtime.

#docker #linux #javascript

CSS Boss

CSS Boss

1606912089

How to create a calculator using javascript - Pure JS tutorials |Web Tutorials

In this video I will tell you How to create a calculator using javascript very easily.

#how to build a simple calculator in javascript #how to create simple calculator using javascript #javascript calculator tutorial #javascript birthday calculator #calculator using javascript and html

Iliana  Welch

Iliana Welch

1595249460

Docker Explained: Docker Architecture | Docker Registries

Following the second video about Docker basics, in this video, I explain Docker architecture and explain the different building blocks of the docker engine; docker client, API, Docker Daemon. I also explain what a docker registry is and I finish the video with a demo explaining and illustrating how to use Docker hub

In this video lesson you will learn:

  • What is Docker Host
  • What is Docker Engine
  • Learn about Docker Architecture
  • Learn about Docker client and Docker Daemon
  • Docker Hub and Registries
  • Simple demo to understand using images from registries

#docker #docker hub #docker host #docker engine #docker architecture #api

Passing Host vs. Container Environment Variables to docker exec

Take a look at below example, on how to use environment variable from host machine vs. container while running _docker exec_:

# pull the image
docker pull goyalmunish/devenv

# fetching env. variable from host machine
docker exec -it devenv /bin/bash -c "echo $HOME"      # /home/ubuntu
# fetching env. variable from container
# use single quotes to escape parsing of environment variable from host machine itself
docker exec -it devenv /bin/bash -c 'echo $HOME'      # /root

As we can see, the first case passes host’s environment variable as part of the command, whereas the second case uses container’s environment variable are used.

…and this is obvious if you recall the difference between bash’s single quotes (full-quoting) and double quotes (partial-quoting).

#docker-cli #environment-variables #docker #bash #exec

Rahul Jangid

1622207074

What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

#javascript #javascript code #javascript hello world #what is javascript #who invented javascript