Learn Javascript With The Js Node

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What is Node.js?

Node.js is a cross-platform, open source JavaScript runtime environment used to execute JavaScript outside of the browser.

It is lightweight and easy to learn for frontend framework developers because it integrates JavaScript into the main server without having to learn another language.

server, with the use of a representative state transfer application programming interface (RESTful API), is an event- based backend that uses endpoints to execute the logic whose the result will be forwarded to the frontend so that the frontend developer can use it on the client side.

Why should you-learn Node.js?

JavaScript is one of the cornerstones of web development right now. Along with HTML and CSS, JavaScript is one of the most popular languages ‚Äã‚Äãfor doing site work.

We use server side Node.js to test our applications outside of a browser environment. The Learning Node.js works very well in building real-time streaming applications and applications development network that require significant use of basic data.

For these reasons, it is a popular choice to include in our technology stack for our back end service.

how long does it take to learn Node.js?

Consistency is essential as you develop the habit of learning new things and thinking like an engineer. For how long it will take to learn Node.js well enough to pursue a career of your own really depends on the time you can devote to learning.

In the end , though, the learning never ends really. Eventually you will become an expert as long as you keep learning. The language and runtime environment are constantly evolving and learning about these changes will require reading and continued instruction

step by step plan to learn Node.js for free

Step 1: Determine your motivation

is there a particular reason for which you want to learn Node.js specifically

do you have an end goal you regret?

What will Node.js do for your project or career?

What does the future hold in terms of job prospects?

If web development, especially backend development, was part of your answer, you are on the right track!

Step 2: Learn Node.js by mastering the basics of Javas script

You don’t You can start developing Node.js until you have a solid understanding of JavaScript basics. The following is a list of topics you need to master before moving on to building back- end applications that will serve as a full stack project:

Getting started on the way

conditionals

Loop

functions

Asynchronous JavaScript

bases base on backend

  • Use NPM or installation node modules that can be used in your main server
  • What is a HTTP request and how it works
  • express.js and other js nodes. to be used as a part of your request and back - end
  • Cross-Origin Resource Sharing (CORS)
  • Difference between SQL and database data NoSQL
  • in how to create a RESTful API

This list is not exhaustive.

There are many other topics in the Node.js world that can be learned. These topics are the bare minimum that you need to master to become a well rounded Node.js developer. In the next section, after the step by step, we’ll take a look at some of the more popular free tutorials on Node.js to get started.

Step 3: create of projects

Integrate your new knowledge in projects using Node.js Getting these reps will not only strengthen your knowledge of JavaScript backend and how to use it, it will also help you create portfolio-worthy code to show to potential employers.

Here are some ideas to get started:

  1. Create a RESTful API with terminals to create, read, update, and delete entries in any directory. Use a NoSQL database to store your information.
  2. Add the first project by adding save and connection parameters . Only allow logged in users to create, update or delete an entry.
  3. Use Socket.io to create a one-to-one application in the chat.
  4. step 4: Move to more difficult projects

    Advance to more difficult projects by adding a frontend to your already created backend project and running it looks great when a user interacts with it online. Try to use all types of databases to practice the different types so that you know when to choose one over the other. Finally, take a look at the projects you have already created to see if they can be more effective.

More advanced project ideas:

  1. collaboration tool like Zoom or Google Hangouts
  2. Web scratching a yes on the web for information
  3. URL / link shortener
  4. Work on an open source project and create a pull demand for it

After these four steps, the world is yours in this regards building Node.js applications! In the next section, we are going to take a look at some tutorials and guides to help you with this point.

Node.js Tutorial

The best and easiest app to make Node.js is to take Node.js tutorials and courses. You can choose a course based on your level of experience, and some courses are even free. Read below to learn more about the best Node.js tutorials to help you improve your software developer skills.

Best Node.js tutorials for beginners

Tutorial Node.js

Tutorial The teacher offers tutorials for programmers to learn the basic concepts of the open source server environment. The tutorials teach you the basics for advanced levels of the environment using Chrome’s V8 JavaScript engine. You will find the tutorials in several sections with multiple topics.

Beginner tutorials have a step by step guide that makes them easier to understand. However, you will still need knowledge of HTML, JavaScript and web applications. To determine if you are ready for the tutorial, you can sit down for the 20 question quiz offered on the platform . The trivia game has no time limit.

Check out the Node.js tutorial < / h3>

You can master Node.js by consulting the TutorialsPoint resources. The step-by-step tutorial will teach you the basics of Node.js with single page apps , streaming sites , and building an actual app. It is a great platform for software developers who want to learn the basics of Node.js and its multiple architectural concepts.

Before entering this tutorial, it is essential that you have a basic understanding of JavaScript. It is a beginner friendly course, but having a basic understanding of JavaScript will make the learning process easier. You should also have experience in languages ‚Äã‚Äãor programming technologies such as HTML, AJAX library or CSS.

The Node.js Master Class

This master class will walk you through the whole Node.js. Pirple Curator Course for just $ 197 to help students master all Node.js and API concepts. You will understand the V8 application architecture , node and different node conventions. The course is also to create a real world RESTful API.

You will also learn how to add configurations, route requests, and add HTTPS support. At the end of the tutorial, you will also know how to create a web application GUI . This means creating, modifying, deleting an account, creating and deleting a session, and creating a check. The platform also offers videos on building a CLI and how to ensure stability and performance.

introduction to Node.js

the learning Node.js can help you develop seamlessly multiple application server side. Node.js has its own great introductory tutorial to help tech professionals . The tutorial teaches several libraries supporting efficiently support the implementation network. The students also learn about Node.js frameworks and tools.

You will learn Express, Egg.js, Adonis.js, Fastify, or HAPI. These are relevant libraries used by the developer community to build real world Node.js applications. You will also receive more documentation on Node.js, ES6 API references and guides with technical aspects of the platform .

Node.js Tutorial: Learn in 3 days

A newbie in the industry can progress to the advanced level by going through the three day Guru99 tutorial. In the first few lessons, you will learn how to download and install Node.js. You will also learn several basic modules of Node.js, how to build HTTP web servers and scalable network applications.

This tutorial will give you an in-depth look at graphQL and rest. You will learn the main differences between Node.js and Angular and Python. To ensure you get a job after your programming training, the platform also offers possible interview questions on Node.js and provides a tutorial for beginners.

The best advanced tutorials on Node.js

The Complete Course Node.js Developer (3rd Edition)

Udemy offers a 36 hour tutorial for professionals at js master node. by creating a real-time application from scratch. The third edition will walk you through three programming languages namely Node.js, Express, and MongoDB. You will learn how to debug Node.js applications and asynchronous programming.

If you want to know how to build web servers and express APIsin, you should consider this advanced tutorial. It also contains courses on creating, testing, and starting Node applications. students how to access APIs from of a browser and the distribution of the application.

Node JS: advanced concepts < / a>

Udemy offers another advanced course to help professionals master all of the advanced concepts of Node.js. for just $ 90, you can capture cycle events, AWS S3 usage, worker threats, and browser automation. It is an excellent course for professionals who want to add skills to their program or simply reinforce their knowledge.

4 p.m., C ++ master , basics of threads, loops knot events, simple yarn tests and a Libuv yarn pool. You will also learn several thread pools, how to change the size of the thread pool, and explain how the operating system works . Udemy also ensures that you will learn how to improve node performance and automate headless browser testing.

Advanced Node.js

You can follow the advanced Node.js Pluralsight tutorial to increase your knowledge. This tutorial will help you master all the concepts of Node.js in less than four hours. You will learn more about the Node architecture .js, CLI node, and C ++ add-ons. Video tutorial teaches event cycle, event architecture, and network node.

This is a great online course for Take your project building skills to the next level. You will learn about child processes, event loops, strands, and form management. You will also learn how to master modern JavaScript, the fundamentals of Node.js, and how to build a server-side application.

Code with node: Ap take by doing

DevSprout presents an online tutorial that helps professionals gain depth on creating productions - evaluating the functionality and features of a web application using node and express.js. This tutorial will teach you ES6, geospatial indexing, searching, paging, or downloading images step by step.

You will learn Bootstrap Express design, templates, user paths, post assets , and user authentication. You will also learn how to download images using Cloudinary and game using MapBox geolocation. You can access the 30 minute tutoring service for $ 100 or the one hour service for $ 200

knowledge of JavaScript , and React Redux. It is relatively difficult course that will help you combine skills in att express and MongoDB through building a complete web-stack application. A When finished, you will have a fully functional Node.js application that can send e - mails to different users.

The best free tutorials on Node.js

Node.js: Getting started

Pluralsight offers a tutorial to help professionals learn Node.js from scratch. This training will help you build your skills in software development. This tutorial is taught by advanced developers. You will gain real world experience to help you find employment at top tech companies such as LinkedIn and Netflix.

You support REPL mode, script execution, and work with timers and command line interfaces. You also touch on modern JavaScript concepts and techniques. Students learn about variables, arrow functions, literal objects, pattern strings and classes.At the end of the course you will have a thorough knowledge of No de.js.

Tutorial Node.js

W3Schools is a popular platform that offers several programming courses, tutorials and resources for experienced developers and new to the industry. The platform offers many examples to help professionals know about Node.js to through examples. you can also try your code in the command line interface.

in addition to the examples Direct you will find integrated modules and downloadable resources Node.js on the official website . Students will learn how Node.js uses asynchronous code, along with its features and functionality . These tutorials are a great way to learn this popular framework and even an experienced developer can benefit.

Basics of Node.js

Academind supports professionals through the introduction to advanced levels in Node.js through 27 tutorials video on YouTube. The video tutorials will teach you how to build your first application, as well as other JavaScript modules and functions for this runtime environment. Before you begin, you must know at least one programming language.

You will also learn how to render HTML for response and routing. The free tutorial also covers MongoDB, Mongoose, and Monk. You will learn how to update, modify and delete data on MongoDB after you configure it. This video tutorial is one of the most accessible Node.js tutorials available for learning server-side code.

Node Js Tutorial for Beginners: Introduction to Node

Smartherd offers 27 video tutorials to help professionals learn all Node.js Fundamentals. By completing the tutorials, you will learn the foundational skills for building scalable and reliable backend services using Node.js. You will also learn several tools that come with Node.

Smartherd also offers step-by-step tutorials on package management, event-based strategies, and coding on interfaces. To complete the tutorial, you will learn modern aspects of JavaScript for use with Node.js.

Learn Node.js and Express with this free 8 hour backend development course

freeCodeCamp pro poses eight one-hour tutorials to help professionals learn the fundamental concepts of Node.js and Express. John Smilga, an instructor, will help you learn the basics of Node and Express. It will also teach you the process of creating a Rest API web application. You will also create a MERN application and several nodes.

The YouTube tutorial

Learn Javascript With The Js Node __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

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:

Learn Javascript With The Js Node __delete__: Questions

2639

Answer #2


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

2639

Answer #3

Python syntax to delete a file

import os
os.remove("/tmp/<file_name>.txt")

Or

import os
os.unlink("/tmp/<file_name>.txt")

Or

pathlib Library for Python version >= 3.4

file_to_rem = pathlib.Path("/tmp/<file_name>.txt")
file_to_rem.unlink()

Path.unlink(missing_ok=False)

Unlink method used to remove the file or the symbolik link.

If missing_ok is false (the default), FileNotFoundError is raised if the path does not exist.
If missing_ok is true, FileNotFoundError exceptions will be ignored (same behavior as the POSIX rm -f command).
Changed in version 3.8: The missing_ok parameter was added.

Best practice

  1. First, check whether the file or folder exists or not then only delete that file. This can be achieved in two ways :
    a. os.path.isfile("/path/to/file")
    b. Use exception handling.

EXAMPLE for os.path.isfile

#!/usr/bin/python
import os
myfile="/tmp/foo.txt"

## If file exists, delete it ##
if os.path.isfile(myfile):
    os.remove(myfile)
else:    ## Show an error ##
    print("Error: %s file not found" % myfile)

Exception Handling

#!/usr/bin/python
import os

## Get input ##
myfile= raw_input("Enter file name to delete: ")

## Try to delete the file ##
try:
    os.remove(myfile)
except OSError as e:  ## if failed, report it back to the user ##
    print ("Error: %s - %s." % (e.filename, e.strerror))

RESPECTIVE OUTPUT

Enter file name to delete : demo.txt
Error: demo.txt - No such file or directory.

Enter file name to delete : rrr.txt
Error: rrr.txt - Operation not permitted.

Enter file name to delete : foo.txt

Python syntax to delete a folder

shutil.rmtree()

Example for shutil.rmtree()

#!/usr/bin/python
import os
import sys
import shutil

# Get directory name
mydir= raw_input("Enter directory name: ")

## Try to remove tree; if failed show an error using try...except on screen
try:
    shutil.rmtree(mydir)
except OSError as e:
    print ("Error: %s - %s." % (e.filename, e.strerror))

Is there a simple way to delete a list element by value?

5 answers

I want to remove a value from a list if it exists in the list (which it may not).

a = [1, 2, 3, 4]
b = a.index(6)

del a[b]
print(a)

The above case (in which it does not exist) shows the following error:

Traceback (most recent call last):
  File "D:zjm_codea.py", line 6, in <module>
    b = a.index(6)
ValueError: list.index(x): x not in list

So I have to do this:

a = [1, 2, 3, 4]

try:
    b = a.index(6)
    del a[b]
except:
    pass

print(a)

But is there not a simpler way to do this?

1055

Answer #1

To remove an element"s first occurrence in a list, simply use list.remove:

>>> a = ["a", "b", "c", "d"]
>>> a.remove("b")
>>> print(a)
["a", "c", "d"]

Mind that it does not remove all occurrences of your element. Use a list comprehension for that.

>>> a = [10, 20, 30, 40, 20, 30, 40, 20, 70, 20]
>>> a = [x for x in a if x != 20]
>>> print(a)
[10, 30, 40, 30, 40, 70]

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