COP 2500 Exam 1

When developing JavaScript programs, if the developer uses the type attribute for the <script></script> tag element, which of the following is correct?

"text/javascript"

What operator is used for concatenation?

+

Which of the following is a valid block comment in JavaScript?

/* This is a block comment */

Given the expression var sum = 19 + 83; which parts of the expression are operands?

19 and 83

The ternary operator, which can be used to replace an if/else conditional statement, requires how many operands?

3

Assuming good HTML form and embedded <script></script>, when using concatenation what output would display based on the statement: document.write(102 + 201);

303

Well-formed statements written in JavaScript end with __________.

; (semi-colon)

Website lifecycle is a request/response loop. A request is made when __________.

A user types in www.insertwhateverhere.com in the URL text box of a Web browser and hits the enter key

The comparison operator != = is used to determine what?

If two operands are not identical in value and type

The JavaScript logical not operator results in the __________.

Reverse evaluation of the condition

When asked to develop unobtrusive JavaScript this means that the JavaScript is __________.

Stored in an external file with a .js file extension

What is the primary difference between a while loop and a do/while loop?

While loops executes 0...n times; do/while loop executes 1...n times

The following JavaScript code is described as switch (color) { case "blue": alert("cold"); case "red": alert("hot"); default: alert("No temperature selected"); }

a. switch b. Multi-way decision c. Alternative to the if/else if condition d. All of the above

Bit is short for __________.

binary digit

To declare a constant, a value that cannot be changed during programming execution requires the use of keyword __________.

const

Which of the following is not a valid data type of that a variable can hold?

const

Decision-making constructs for control flow such as if, if/else, if/else if, and switch

control expressions

The variable named data is initialized as follows: var data = "Data data data"; and is reused later in the JavaScript program. Which of the following is not a valid reuse of the variable data?

data= 5.5

What is the difference between document.write() and document.writeln()?

document.writeln() advances the cursor to the next line whereas document.write() does not

JavaScript is a stand-alone scripting language like Perl and Python.

false

JavaScript is the same as Java and as HTML

false

Data hierarchy comprises bits, characters, __________, records, and files.

fields

JavaScript is used to enhance ________ Web pages for an interactive experience. a. HTTP

html

JavaScript can __________.

improve website usability

What is the output of the following JavaScript code? <script> var counter = 0; while( counter < 5 ) { document.writeln( counter * 2); } </script>

infinite loop

JavaScript programs are executed by a JavaScript _________ in a Web browser.

interpreter

Which of the following is not part of the three layers of a Web page?

java

&& and || are called what in JavaScript?

logical operators

JavaScript is a __________ programming language.

loosely typed

The following JavaScript code is an example of what type of loop? <script> var asterisk = "*"; for (var row = 0; row < 10; row++) { for (var column = 0; column < row; column++) { document.writeln(asterisk); } document.writeln("<br>"); } </script>

nested loop

When using the typeof() function what does a value of null mean?

no valid data types

Primitive data types are assigned __________.

single literal values

Assuming good HTML form and embedded <script></script>, when using concatenation what output would display based on the statement: document.write("The temperature is" + 89);

the temperature is 89

HTML Web page files are saved using file extension .htm or .html.

true

Numeric literals can be integers (whole numbers) and floating point (fractional numbers with a decimal point).

true

Composite data types, also known as complex types, consist of more than one component. Valid composite data types include all of the following except __________.

undefined

When naming variables in JavaScript, which of the following would not be valid?

var #32829;

What are the three looping constructs in JavaScript?

while,do/while,for