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Purpose of document.write

Although this is a simplification, for purposes of the modules in this collection, it will suffice to say that the purpose of the document.write command is to cause the items in its argument list to be displayed in the browser window. You can place one or more items in the argumentlist. If there is more than one item in the argument list, the items must be separated by a comma as shown in Listing 1 .

Displaying strings

With some exceptions, items that appear in the argument list surrounded by matching quotation marks (strings) will be displayed in the browser window.

The exceptions include the second item in the above list . This item is a special command to the browser, commonly known as a break tag. The occurrence of a break tag tells the browser to go down to the next line before displaying any additional material.

Such browser commands usually begin with a left angle bracket as shown in Listing 1 . Because of this, it is usually wise to avoid displaying strings that begin with left angle brackets unless you know for sure that your string won'tbe interpreted as a command to the browser.

Displaying material other than strings

I will show you how to display material other than strings in a later section titled The string concatenation operator . Before getting into that, however, I will discuss several other topics.

Structured programming

When a student enrolls in the Object-Oriented Programming course that I teach at Austin Community College, I expect that student to have knowledge of something calledstructured programming, which is generally defined as including the following topics:

  1. Functions with parameter passing
  2. Sequence
  3. Selection (if-else)
  4. Repetition (for, while, and do-while loops)

I also expect them to know how to use variables and how to use operators (add, subtract, multiply, divide, etc.).

You will need to have an introductory knowledge of these topics to understand the JavaScript scripts that I will use to explain physics concepts in latermodules. I will briefly explain these topics in this module and will discuss them further in later modules where they are used.


Functions, or procedures as they are called in some languages, provide a fundamental building block for virtually every programming language. The purposeof a function is to encapsulate the ability to perform a task into a single set of code and to be able to execute that code from a variety ofdifferent locations within the script. This can eliminate the requirement to repeat the same code over and over when the same task is required at multiplepoints in the script.

The surface area of a sphere

For example, if you write a script that frequently needs to calculate the surface area of a sphere, you can encapsulate those calculations in a function.Then, whenever your script needs to know the surface area of a sphere, it can simply call the function and provide the radius of the sphere as a parameter.The function will perform the calculation and return the answer to be used by the script at that point.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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