Learn Javascript

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How to Learn JavaScript

Many web pages you interact with on a daily basis are based on JavaScript. The telltale sign that JavaScript is being used on a page is if the site has interactive functionality.

Consider Netflix. You can interact with the Netflix dashboard. You can choose a show to watch and that show will begin to load. Moving between pages is seamless through the use of transitions. All of this would be impossible without JavaScript.

In this guide, we’ve put together some tips on how to start learning JavaScript.

What is JavaScript?

JavaScript is a scripting language. It allows you to add interactive features to a web page. For example, JavaScript allows you to add animation to a page or load additional data on a page after that page has already loaded. It is generally used with HTML and CSS.

JavaScript is used in both the front-end and the back-end of websites. So-called "vanilla JavaScript" powers the interactive features you see on the client side. For example, if you click a button and a dialog pops up, you can bet JavaScript was involved.

Today there are many frameworks that extend JavaScript. These include React and Angular.js. By using these frameworks, you can develop more complex applications.

What is JavaScript used for?

JavaScript is used to add interactive elements to a web page and to create web servers and mobile applications. JavaScript is usually added after HTML and CSS for a web page, which respectively define the structure and style of a page.

Here are the main goals of JavaScript:

  • To make sites more interactive . JavaScript allows you to add features such as audio and video playback, interactive menus, animations, and image carousels.
  • To create web servers . Backend frameworks like Node.js allow you to build web servers with JavaScript. This means that you can power both the front end and the back end of your site using JavaScript without having to depend on another scripting language for the back end.
  • Game Development . JavaScript is used to develop many browser games you see today, from solitary versions to more complex internet games.

Learn JavaScript

JavaScript is an invaluable skill for learning in the modern economy. With websites playing an increasingly important role in how we consume information and have fun, you can expect that many companies are looking to hire skilled JavaScript developers.

But that leaves us with the question.: how to learn JavaScript? This is a good question that we should consider for some time.

Why should I learn JavaScript?

There are many reasons why you should learn JavaScript.

JavaScript is easy to use

The reason JavaScript is often so preferred by new developers is that it is a higher level language and most intricacies of your code are executed by machine rather than in your code.

JavaScript offers a simple syntax somewhat reminiscent of the English language, which makes it easy to build strong mental connections with the programming concepts you are dealing with.

JavaScript is versatile

JavaScript allows you to add many interactive features to a website, from video players and functional buttons to images that change when clicked.

That’s not all. The so called "vanilla JavaScript" (where you only use JavaScript) is only part of the coding in JavaScript. Once you’ve learned the basics of JavaScript, you can broaden your skills and use them to master a library like Angular, Vue.js, and React.js. These technologies are all used for web development in a wide range of different contexts.

You can also use the skills you learned by learning JavaScript with a framework like Node.js to build web applications. . Or you can use your JavaScript skills with React Native or another mobile framework to build a mobile app.

JavaScript Developers Are in High Demand

Whether or not you are looking to start a career in tech today, it is always heartwarming to know that the skills you develop can be transferred when needed. In the case of JavaScript, because it is such a crucial part of the Internet, there are companies that are constantly on the lookout for talented developers with JavaScript skills.

The TIOBE index, which uses search engine results to estimate the popularity of major programming languages, currently classifies JavaScript as the seventh most popular programming language (as of April 22, 2020).

Need to be more convincing? According to the United States Bureau of Labor Statistics, the application for web developers must will increase by 13% by 2028. While this statistic does not specifically track JavaScript, it gives us a strong indication of increasing demand from web developers . If that’s not enough, as of April 22, 2020, Glassdoor will present 21,495 JavaScript Developer Jobs !

Taken together, these facts paint a clear picture of how learning JavaScript can affect your career. Additionally, if you specialize in skills like React.js or Node.js, you might even find yourself in even higher demand as these frameworks are growing in popularity and being used in an increasing number of applications.

How long does it take to learn JavaScript?

It takes six to nine months to learn the basics of JavaScript to the point that you feel comfortable writing your own programs. This assumes that you are studying for about an hour a day. For now, you’ll only scratch the surface of JavaScript. There is so much to learn that it might take you over a year to learn some of the more advanced features.

How long will it take you How to learn Ja vaScript depends on your career goals and motivation.

If you are learning JavaScript with the hope of becoming a web developer, six to nine months is a good time to aim while you study part-time. But you can decide to study full time to speed up your learning. In this case, you may be able to master the basics of JavaScript within five to six months.

To become a professional web developer, you should expect to continue to learn, even after changing careers. . New frameworks or updates to existing frameworks are released every year which you can follow if you want to build more powerful JavaScript applications.

Is it difficult to learn JavaScript?

JavaScript is This is not a difficult language to learn. Learn as long as you have a basic understanding of web development. You don’t need any programming experience to get started with JavaScript, although you do need to know how to use HTML and CSS.

You can expect to spend months learning the basics of JavaScript, whether or not you are new to the language. There will be challenges along the way. But, with the wide array of resources available, you shouldn’t have a problem finding a solution to any issues you are having.

Additionally, JavaScript has simple syntax. This means that the JavaScript code is easy to read and understand. Since the code is easy to read and understand, it shouldn’t take long to start identifying the patterns in the code you’ll be using while working on JavaScript.

How to learn JavaScript: step by step

There is no such thing as a "right way" to learn to code in JavaScript. It all depends on how you learn best. Some students prefer tutorials while others prefer online courses.

Let’s discuss the high level path you should take to learn JavaScript:

  1. Determine your motivation. To get started, first ask yourself why you are learning JavaScript. It will help you stay motivated even in the face of tough challenges.
  2. Master the basics. The first step should be to learn the basics of JavaScript. Spend time learning variables, syntax, if statements, and everything newbies need to know.
  3. Build projects. There is no better way to learn a programming language than to build projects. Pick a website that you really want to see exist, and then use your learned skills to bring that site to life.
  4. Join a community of programmers. Online communities like StackOverflow and Dev.to are great places to meet other developers. In these communities, you can ask other programmers for help and find examples that can help you learn.
  5. Take on more difficult challenges. After you’ve created a few basic models, you might think about how to make them more impressive. Can you speed up your projects? Or add more features? This will increase your knowledge of JavaScript and get you used to thinking about more efficient ways to write code.

The Best JavaScript Courses

There are hundreds of online courses that cover JavaScript and web development. But how do you know which one to subscribe to? This is an excellent question.

Below we have listed some of the best free online JavaScript courses that will help you expand your knowledge of programming languages.

Udemy: learn how to program in JavaScript: from beginner to professional

Price : FREE

Certificate : no available

This online course aims to make you a great programmer. Some of its main goals are to make sure you understand the concept of object orientation. Object orientation is an important idea in programming.

The course is designed for students who want to learn JavaScript from scratch. However, it would be best if you are already familiar with HTML and CSS as both of these go hand in hand with JavaScript.

To be more comprehensive, the course also includes discussions on possible limitations of JavaScript. This way you can know how to solve the challenges.

edX: Introduction to JavaScript

Price : FREE

Certified : Available for $ 199

Via WC3, this course is part of a web development program. Essentially, the ultimate goal is to make your website more interactive. With the help of JavaScript, this is not far from achievable.

This introductory course will teach you how to add dynamic and multimedia content to your website. Through in-store activities, you will discover how powerful this script can be and its many tools that you can use to your advantage.

A modern understanding of JavaScript is required to keep you abreast of changing times.

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Learn-JS: JavaScript < / a>

Price : FREE

Certified : not available

Learn-JS is a Free tutorial database on JavaScript and other web development resources. There is a JavaScript specific tab that contains links to tutorials on the topics below. They are self-taught and require your full attention to learn.

The categories are separated between basic and advanced tutorials. The basics would include essentials such as learning variables and types, conditions, functions, etc. In the meantime, there are advanced tutorials on object-oriented JavaScript, among others.

Course: Interactivity with JavaScript

Price : FREE

Certificate : Available

As part of A web design specialization program, this course is designed to teach you how to add interactivity through JavaScript. Interactivity includes functional capabilities to automatically populate data recorded on a website.

You should have knowledge of HTML, CSS and JavaScript before taking this course. In fact, you can start building real projects in the form of ideas so that you can come up with something after completing this course.

Udacity: Object-oriented JavaScript

Price : FREE

Certificate : not available

It takes about three weeks to complete this course on object orientation with JavaScript. Web developers will learn to build applications using reliable code.

Part of the process of immersing in object orientation is always trying to keep objects that best represent their data and function. This course is a step in ensuring that all elements of the website are taken care of.

Interactive quizzes are also available for this program.

JavaScript tutorial

JavaScript is a popular programming language used to power many major components of the website . This object-oriented computer programming language is mainly used by developers to make web pages interactive and responsive. Over time, JavaScript has become an integral part of the browser experience, with more and more websites looking for developers to improve interactivity and the overall user experience.

We recommend signing up for a superior JavaScript coding bootcamp to really master language. These programs offer a great alternative to earning an online degree. Most bootcamps also offer career services that should help you find employment in related fields.

However, if you want to explore the language further before you put in more effort, you should consider other online resources. Here are some of the best online JavaScript tutorials that you can find on the internet.

The best JavaScript tutorials for beginners

Learn JavaScript Complete Beginner’s Course

freeCodeCamp is a non-profit organization that provides free programming resources to help aspiring developers learn programming, including tutorials for beginners. This 3+ hour YouTube tutorial is great for beginners because it introduces you to the basic topics to get you started.

You will also learn how to declare variables, divide numbers and access data in an array. The tutorial also covers augmented addition, parenthesis notation, and variables, among other advanced topics. The tutorial is divided into 134 parts.

Learn JavaScript

This is a full tutorial offered by Codecademy, on the best bootcamp programming that has helped thousands of people launch their careers in technology. Many Codecademy graduates are employed at companies such as Google, NASA, and IBM.

According to its official website, over 1.6 million people have taken this course, which takes around 20 hours of learning. You will learn about conditional statements, functions, scope, loops, objects, iterators, and arrays.

This course includes tutorials with pictures and videos that will help you learn programming using JavaScript. You can take this course for free, but the paid "pro" course offers several interesting advanced features and benefits.

JavaScript - The complete guide 2021 (beginner + advanced)

Udemy is a popular online course provider used by many aspiring programmers who hope to increase their technical skills. Over 81,000 students have taken this particular JavaScript course. It usually costs $ 89.99, but there are regular sales that greatly reduce the price. The only prerequisite is a functioning computer.

This course is available online and includes expert video tutorials. They will help you become a JavaScript master in about 52 hours of learning. During this time, you will learn how to perform testing, security, distribution, manipulation of web pages, debugging, variables, and data types.

JavaScript Guide

Looking for a step by step guide to learn JavaScript ? Consider this Mozilla Developers Guide Online. This comprehensive guide includes interactive tutorials for learning the ins and outs of JavaScript.

You will study JavaScript fundamentals, control flow, error handling, loops, iteration, expressions and operators, functions, numbers, text formatting and objects. This site also has intermediate and advanced JavaScript guides if you want to continue your education after mastering the fundamentals.

The full JavaScript course 2021: From zero to expert!

This Udemy course will help you move from beginner to expert JavaScript. Over 500,000 students have taken this fee-based course and have rated the program positively. It takes around 68 hours of learning, during which you will learn the basics of JavaScript and work on real projects.

The course contains many videos which serve as excellent tutorials to help you develop your programming skills. You do not need any previous experience to take this course, but you will need a computer with a Windows, Mac, or Linux operating system.

The best advanced JavaScript tutorials

JavaScript the difficult parts: asynchronous JavaScript

Codesmith is a world-class school offering immersive software engineering courses in 15 countries and several states in the United States. This course covers JavaScript and what it means to be a JavaScript engineer.

Main topics covered include the call stack, event loop, background threads, and callback queue to help advanced engineers troubleshoot asynchronous issues. This free YouTube tutorial is two hours and 36 minutes long.

Asynchronous JavaScript with async / wait

This egghead.io course covers async ES2017 and expects keywords to help developers write asynchronous functions. The tutorials are provided online as a video, but this site also offers transcripts for those who prefer to study the text.

JavaScript the hard parts: object-oriented programming

Codesmith co-founder offers this free YouTube tutorial designed for experienced programmers. It covers prototypes, factories, classes, manufacturers and the E5 and E6 approaches. The video is about an hour long and delves into the delicate parts of JavaScript that most novice programmers will find difficult.

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Learn Javascript __del__: Questions

How can I make a time delay in Python?

5 answers

I would like to know how to put a time delay in a Python script.

2973

Answer #1

import time
time.sleep(5)   # Delays for 5 seconds. You can also use a float value.

Here is another example where something is run approximately once a minute:

import time
while True:
    print("This prints once a minute.")
    time.sleep(60) # Delay for 1 minute (60 seconds).

2973

Answer #2

You can use the sleep() function in the time module. It can take a float argument for sub-second resolution.

from time import sleep
sleep(0.1) # Time in seconds

Learn Javascript __del__: Questions

How to delete a file or folder in Python?

5 answers

How do I delete a file or folder in Python?

2639

Answer #1


Path objects from the Python 3.4+ pathlib module also expose these instance methods:

Removing white space around a saved image in matplotlib

2 answers

I need to take an image and save it after some process. The figure looks fine when I display it, but after saving the figure, I got some white space around the saved image. I have tried the "tight" option for savefig method, did not work either. The code:

  import matplotlib.image as mpimg
  import matplotlib.pyplot as plt

  fig = plt.figure(1)
  img = mpimg.imread(path)
  plt.imshow(img)
  ax=fig.add_subplot(1,1,1)

  extent = ax.get_window_extent().transformed(fig.dpi_scale_trans.inverted())
  plt.savefig("1.png", bbox_inches=extent)

  plt.axis("off") 
  plt.show()

I am trying to draw a basic graph by using NetworkX on a figure and save it. I realized that without a graph it works, but when added a graph I get white space around the saved image;

import matplotlib.image as mpimg
import matplotlib.pyplot as plt
import networkx as nx

G = nx.Graph()
G.add_node(1)
G.add_node(2)
G.add_node(3)
G.add_edge(1,3)
G.add_edge(1,2)
pos = {1:[100,120], 2:[200,300], 3:[50,75]}

fig = plt.figure(1)
img = mpimg.imread("image.jpg")
plt.imshow(img)
ax=fig.add_subplot(1,1,1)

nx.draw(G, pos=pos)

extent = ax.get_window_extent().transformed(fig.dpi_scale_trans.inverted())
plt.savefig("1.png", bbox_inches = extent)

plt.axis("off") 
plt.show()
228

Answer #1

You can remove the white space padding by setting bbox_inches="tight" in savefig:

plt.savefig("test.png",bbox_inches="tight")

You"ll have to put the argument to bbox_inches as a string, perhaps this is why it didn"t work earlier for you.


Possible duplicates:

Matplotlib plots: removing axis, legends and white spaces

How to set the margins for a matplotlib figure?

Reduce left and right margins in matplotlib plot

228

Answer #2

I cannot claim I know exactly why or how my “solution” works, but this is what I had to do when I wanted to plot the outline of a couple of aerofoil sections — without white margins — to a PDF file. (Note that I used matplotlib inside an IPython notebook, with the -pylab flag.)

plt.gca().set_axis_off()
plt.subplots_adjust(top = 1, bottom = 0, right = 1, left = 0, 
            hspace = 0, wspace = 0)
plt.margins(0,0)
plt.gca().xaxis.set_major_locator(plt.NullLocator())
plt.gca().yaxis.set_major_locator(plt.NullLocator())
plt.savefig("filename.pdf", bbox_inches = "tight",
    pad_inches = 0)

I have tried to deactivate different parts of this, but this always lead to a white margin somewhere. You may even have modify this to keep fat lines near the limits of the figure from being shaved by the lack of margins.

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