why is the course called "Intro to JS" when you learn Processing.JS not JavaScript, two similar but very different programming languages?

They are not different languages - processing.js is a javascript library. That means it is a set of javascript functions which, in this case, allow you to easily draw to the canvas with javascript. When you use processing.js you are using javascript.

So do I need to do the intro to javascript first or do you teach what we need to know here on this course

The things you learn in _Intro to JS_ are definitely very useful. That's where you learn the basics of the JavaScript language. Here you learn to apply that to web pages. I'm not sure how essential _Intro to JS_ is, but it's recommended nonetheless.

what are the diferent meta charsets?

There is a list here http://www.iana.org/assignments/character-sets/character-sets.xhtml perhaps this helps https://www.w3schools.com/tags/att_meta_charset.asp

how do you know what signs to use when u code

Look at the documentation tab below a project, challenge, or your own program

How do I use Inspect Element to test a change in JS? e.g. I have this line of code: var regionalLinkt='true'; which makes a link visible on the page, but I want to test the page with this set to 'false'. I was able to edit it to 'false' in inspect element, but not seeing the page changes?

JavaScript won't re-execute after a variable is changed; any execution involving that variable would already have taken place. I'd need to know how the page is implemented before I can give a better answer.

Why are these questions hard because I answered all correctly but they said wrong? Please tell :(

They aren't hard. I also got a couple wrong but if you think they are correct then, you might want to check again.

why java script is important in webpage

It is used to make webpages interactive. Imagine a webpage where you can't do anything! That's where JavaScript comes in.

Is _JavaScript_ compatible with _Python_?

No, python and javascript are two diffrent programming languages, and therefore are not compatible with each other. However, a knowlage of one helps with learning the other. ~AlphadogStuidos

Can you accidentally get a virus from JavaScript?

My friend did, tho, messed w/ his laptop so that it could only show an image of a cat dancing on a Roomba, I had to route the base code into another laptop and manually track down the virus to get rid of it. Then again, I sent him the virus (XD), crossed it with a bit of html css and Python so it could root itself deep into the code, took me at least an hour to get it out. Worth my time and trouble, tho!

Main content

Course: Computer programming - JavaScript and the web > Unit 6

Lesson 1: Get ready to make your webpages interactive

Review JavaScript

Google Classroom

You should review each of these core concepts, which you can do here on Khan Academy in our Intro to JS course:

Variables: how to declare variables, assign, re-assign, and local vs. global scope.
Data types: numbers, booleans, strings, arrays, and objects.
Functions: how to group code into functions, pass arguments to them, and return values from them.
Conditionals: how to use if/else statements and logical expressions.
Loops: how to use while and for loops to repeat code.

You can check how well you remember everything in the quiz up next.

Want to join the conversation?

Sort by:

Karl Steenepoorte
Posted 9 years ago. Direct link to Karl Steenepoorte's post “why is the course called ...”
why is the course called "Intro to JS" when you learn Processing.JS not JavaScript, two similar but very different programming languages?
Button navigates to signup pageComment on Karl Steenepoorte's post “why is the course called ...”
(30 votes)
Answer
- Peter Collingridge
  Posted 9 years ago. Direct link to Peter Collingridge's post “They are not different la...”
  They are not different languages - processing.js is a javascript library. That means it is a set of javascript functions which, in this case, allow you to easily draw to the canvas with javascript. When you use processing.js you are using javascript.
  Comment on Peter Collingridge's post “They are not different la...”
  (152 votes)
wolverine256
Posted 8 years ago. Direct link to wolverine256's post “So do I need to do the in...”
So do I need to do the intro to javascript first or do you teach what we need to know here on this course
Button navigates to signup pageButton navigates to signup page
(11 votes)
Answer
- Dalendrion
  Posted 8 years ago. Direct link to Dalendrion's post “The things you learn in _...”
  The things you learn in Intro to JS are definitely very useful. That's where you learn the basics of the JavaScript language.
  Here you learn to apply that to web pages.
  I'm not sure how essential Intro to JS is, but it's recommended nonetheless.
  Comment on Dalendrion's post “The things you learn in _...”
  (16 votes)
Deym Miles
Posted 7 years ago. Direct link to Deym Miles's post “what are the diferent met...”
what are the diferent meta charsets?
Button navigates to signup pageButton navigates to signup page
(9 votes)
Answer
- Jim E
  Posted 7 years ago. Direct link to Jim E's post “There is a list here ...”
  There is a list here
  http://www.iana.org/assignments/character-sets/character-sets.xhtml
  
  perhaps this helps
  https://www.w3schools.com/tags/att_meta_charset.asp
  Comment on Jim E's post “There is a list here ...”
  (6 votes)
tyguy the math geek
Posted 5 years ago. Direct link to tyguy the math geek's post “how do you know what sign...”
how do you know what signs to use when u code
Button navigates to signup pageButton navigates to signup page
(5 votes)
Answer
- William Wang
  Posted 5 years ago. Direct link to William Wang's post “Look at the documentation...”
  Look at the documentation tab below a project, challenge, or your own program
  Comment on William Wang's post “Look at the documentation...”
  (8 votes)
Wing T
Posted 8 years ago. Direct link to Wing T's post “How do I use Inspect Elem...”
How do I use Inspect Element to test a change in JS? e.g. I have this line of code:
var regionalLinkt='true';
which makes a link visible on the page, but I want to test the page with this set to 'false'. I was able to edit it to 'false' in inspect element, but not seeing the page changes?
Button navigates to signup pageButton navigates to signup page
(3 votes)
Answer
- DY
  Posted 8 years ago. Direct link to DY 's post “JavaScript won't re-execu...”
  JavaScript won't re-execute after a variable is changed; any execution involving that variable would already have taken place.
  
  I'd need to know how the page is implemented before I can give a better answer.
  Button navigates to signup page
  (5 votes)
amandaazzalina
Posted 3 years ago. Direct link to amandaazzalina's post “Why are these questions h...”
Why are these questions hard because I answered all correctly but they said wrong? Please tell :(
Button navigates to signup pageComment on amandaazzalina's post “Why are these questions h...”
(3 votes)
Answer
- CoraL
  Posted 3 years ago. Direct link to CoraL's post “They aren't hard. I also...”
  They aren't hard. I also got a couple wrong but if you think they are correct then, you might want to check again.
  Comment on CoraL's post “They aren't hard. I also...”
  (5 votes)
messi
Posted a year ago. Direct link to messi's post “So do I need to do the in...”
So do I need to do the intro to javascript first or do you teach what we need to know here on this course
Button navigates to signup pageButton navigates to signup page
(4 votes)
Answer
- >: #BringBackBackgrounds
  Posted 9 months ago. Direct link to >: #BringBackBackgrounds's post “You need to do intro to j...”
  You need to do intro to java
  Comment on >: #BringBackBackgrounds's post “You need to do intro to j...”
  (1 vote)
ranjanamahajan360
Posted 4 years ago. Direct link to ranjanamahajan360's post “why java script is import...”
why java script is important in webpage
Button navigates to signup pageButton navigates to signup page
(2 votes)
Answer
- ༺ℛ𝒶𝒸𝒽ℯ𝓁༻ [inactive]
  Posted 4 years ago. Direct link to ༺ℛ𝒶𝒸𝒽ℯ𝓁༻ [inactive]'s post “It is used to make webpag...”
  It is used to make webpages interactive. Imagine a webpage where you can't do anything! That's where JavaScript comes in.
  Button navigates to signup page
  (2 votes)
Arios
Posted 4 years ago. Direct link to Arios's post “Is _JavaScript_ compatibl...”
Is JavaScript compatible with Python?
Button navigates to signup pageButton navigates to signup page
(2 votes)
Answer
- 𝙕𝙚 𝙍𝙚𝙙 𝘽𝙖𝙧𝙧𝙤𝙣
  Posted 4 years ago. Direct link to 𝙕𝙚 𝙍𝙚𝙙 𝘽𝙖𝙧𝙧𝙤𝙣's post “No, python and javascript...”
  No, python and javascript are two diffrent programming languages, and therefore are not compatible with each other. However, a knowlage of one helps with learning the other.
  
  ~AlphadogStuidos
  Comment on 𝙕𝙚 𝙍𝙚𝙙 𝘽𝙖𝙧𝙧𝙤𝙣's post “No, python and javascript...”
  (2 votes)
Angel Greene
Posted 6 years ago. Direct link to Angel Greene's post “Can you accidentally get ...”
Can you accidentally get a virus from JavaScript?
Button navigates to signup pageButton navigates to signup page
(1 vote)
Answer
- David Tuell
  Posted 6 years ago. Direct link to David Tuell's post “My friend did, tho, messe...”
  My friend did, tho, messed w/ his laptop so that it could only show an image of a cat dancing on a Roomba, I had to route the base code into another laptop and manually track down the virus to get rid of it.
  
  Then again, I sent him the virus (XD), crossed it with a bit of html css and Python so it could root itself deep into the code, took me at least an hour to get it out.
  Worth my time and trouble, tho!
  Button navigates to signup page
  (3 votes)