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Finally, another reason that I prefer JavaScript over Ruby for teaching purposes is that JavaScript is very easy to experiment with after completing the course. Allthat is required is a browser and a text editor.

For example, if you use a text editor to copy the text shown below into a plain text file with an extension of htm or html , and then open that file in your browser, the JavaScript code between the beginning and ending script tags will be executed.

<html><body><script LANGUAGE="Javascript1.8"><!-- Comment: put JavaScript code here -->document.write("Hello from JavaScript")</script></body></html>

The text shown above will cause the following text to appear in the browser window:

Hello from JavaScript

Codecademy Web Fundamentals

This course will teach you how to code HTML and CSS. HTML and CSS are not programming languages per se, but they do fall in the category ofcoding. Virtually every web page is based on HTML and web pages are often made more attractive through the use of CSS. Therefore, every coder needsto know how to code using HTML and CSS.

Like JavaScript, HTML and CSS are very easy to experiment with after completing the course. All that is required is a browser and a text editor. Simply create your HTML and CSSfiles using a text editor and then open the HTML file in your browser to see the results.

Codecademy Ruby

While JavaScript is the ubiquitous programming language for interactive web pages, Ruby is fast becoming one of the most popular programming languages forlarge-scale commercial websites. Those students who plan to go in that direction will do well to learn to program using the Ruby programming language.

Unlike JavaScript, some effort is required to get your computer set up to experiment with Ruby after you finish the course. You will probably need to dosome web research to learn exactly how to do that.

Codecademy PHP and Python

The curious among you may wonder why I didn't include the Codecademy PHP and Python courses in my list of preferences. The answer is simple. As of thiswriting, I haven't had time available to work through and evaluate those courses.

Udacity - Introduction to Computer Science

The curious among you may also wonder why this is near the bottom of my list of preferred courses. I put it there largely because it is aninteractive video course and I don't consider video to be a very effective way to learn how to code.

This is a free course in computer science intended for beginners. You must establish an account to take the course, but as of March 2013 the course isfree. Having an account is an advantage. If you need to log out and do something else before completing a lesson, the next time you log in, the Udacity systemallows you to resume at the point where you left off earlier.

Online video with interactive quizzes

This course makes an interesting and relatively seamless use of video content with interactive quizzes, but it is not for younger learners. It moves at a fairly rapid pace and I have noticed that sometimes the author includesmaterial on the quizzes that has not yet been discussed in the videos. Don't be too concerned, therefore, if you are unable to answer the questions on thequizzes the first time through.

Questions & Answers

can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
im not good at math so would this help me
Rachael Reply
yes
Asali
I'm not good at math so would you help me
Samantha
what is the problem that i will help you to self with?
Asali
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Teaching beginners to code. OpenStax CNX. May 27, 2013 Download for free at http://cnx.org/content/col11498/1.20
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