The book makes understanding variables quite easy. We’ll add a little here:
Most languages have a way to define constants. A constant is a value that cannot be changed.
In some languages, constants are variables that are not allowed to be changed.
In some languages, constants are variables that should not be changed.
In some languages, constants look like variables, but are really just values that are used by the compiler or interpreter.
JavaScript does not have a way to define or use constants!
Many languages require that the type of the variable be defined. For instance, in Java you might define:
int x;
Which means to define a variable called x and to specify that it will contain an integer. These languages are “strongly typed”. JavaScript is not “typed”, because:
var x;
Can contain an integer, a floating point value, a string, or anything you like.
Likewise, the book does a good job on functions, but here’s a little more info:
Many languages, especially “strongly typed” languages, make a distinction between functions and subroutines.
A function returns a value of a certain type
A subroutine does not return a value (in other words, it’s a function that does not return a value)
Since JavaScript is not a “strongly typed” language, there is no reason to make a distinction between functions that return a value and those that don’t.
Using only the techniques from modules one and two, and chapters one through four of the textbook:
Create two files, one named second.html and the other named second.js
Write code to create a web page that uses a JavaScript program to output a NASA style count down:
Ten
Nine
…
One
Ignition Start
Liftoff
We have Liftoff!
Each line must be displayed as an alert
Create a generic function that outputs one line of the countdown as an alert, and receives the data to output as an input parameter.
Use that function to output each line of the countdown.
Each line, after the first line, must only be output when the user clicks “Ok” in response to the alert.
Use comments and lay the code out so it can be easily followed!
Each file in the assignment must have a comment at the top, using the correct commenting technique for the file type, like this:
Your Name
Your Student ID
CST140
Assignment 2
Test your program by opening the web page in your browser. You should see the NASA countdown displayed as a series of alerts (which are displayed one at a time in a popup window.) Click the OK button to display the next line in the countdown.
No text is required to be written directly to the browser window.
Why Work with Us
Top Quality and Well-Researched Papers
We always make sure that writers follow all your instructions precisely. You can choose your academic level: high school, college/university or professional, and we will assign a writer who has a respective degree.
Professional and Experienced Academic Writers
We have a team of professional writers with experience in academic and business writing. Many are native speakers and able to perform any task for which you need help.
Free Unlimited Revisions
If you think we missed something, send your order for a free revision. You have 10 days to submit the order for review after you have received the final document. You can do this yourself after logging into your personal account or by contacting our support.
Prompt Delivery and 100% Money-Back-Guarantee
All papers are always delivered on time. In case we need more time to master your paper, we may contact you regarding the deadline extension. In case you cannot provide us with more time, a 100% refund is guaranteed.
Original & Confidential
We use several writing tools checks to ensure that all documents you receive are free from plagiarism. Our editors carefully review all quotations in the text. We also promise maximum confidentiality in all of our services.
24/7 Customer Support
Our support agents are available 24 hours a day 7 days a week and committed to providing you with the best customer experience. Get in touch whenever you need any assistance.
Try it now!
How it works?
Follow these simple steps to get your paper done
Place your order
Fill in the order form and provide all details of your assignment.
Proceed with the payment
Choose the payment system that suits you most.
Receive the final file
Once your paper is ready, we will email it to you.
Our Services
No need to work on your paper at night. Sleep tight, we will cover your back. We offer all kinds of writing services.
Essays
No matter what kind of academic paper you need and how urgent you need it, you are welcome to choose your academic level and the type of your paper at an affordable price. We take care of all your paper needs and give a 24/7 customer care support system.
Admissions
Admission Essays & Business Writing Help
An admission essay is an essay or other written statement by a candidate, often a potential student enrolling in a college, university, or graduate school. You can be rest assurred that through our service we will write the best admission essay for you.
Reviews
Editing Support
Our academic writers and editors make the necessary changes to your paper so that it is polished. We also format your document by correctly quoting the sources and creating reference lists in the formats APA, Harvard, MLA, Chicago / Turabian.
Reviews
Revision Support
If you think your paper could be improved, you can request a review. In this case, your paper will be checked by the writer or assigned to an editor. You can use this option as many times as you see fit. This is free because we want you to be completely satisfied with the service offered.