JavaScript
When creating an array in JavaScript using var myArray = new Array();, Array() is called a __________.
Constructor
The for loop contains how many expressions separated by semicolons?
Three
The following call to a JavaScript function is valid. <form> <input type="button" value="Welcome" onClick="greetings('Students');"> </form>
True
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
The comparison operator != = is used to determine what?
If two operands are not identical in value and type
JavaScript can __________.
Improve website usability.
JavaScript programs are executed by a JavaScript _________ in a Web browser.
Interpreter
A JavaScript function can be called using the HTML anchor tag element, for example <a href="JavaScript:greetings()">Click here</a>
True
Functions in JavaScript are self-contained units of program written to accomplish a specific task
True
In JavaScript the following code examples have equivalent results. Example 1: dog.breed = "German Shepard"; Example 2: dog["breed"] = "German Shepard";
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 does an HTML document become a document object?
When the HTML document is loaded in a web browser
Anonymous functions in JavaScript are unique because its definition is assigned to a __________ since they don't have a __________.
variable name
What are the three looping constructs in JavaScript?
while, do/while, for
When a function is defined in JavaScript the expected received data values are called?
Parameters
The ternary operator, which can be used to replace an if/else conditional statement, requires how many operands?
3
Well-formed statements written in JavaScript end with __________.
;
Regular functions must include which of the following? Keyword function Parenthesis Curly braces
All of these
When passing data to a function in JavaScript which of the following statements is true? Data values passed to a function are called arguments Multiple data values passed to a function are separated using a comma Data values passed to a function are enclosed in parentheses
All of these
After a function has been declared in the <head></head> section of the HTML document, how many times can it be used in the <body></body>?
As many times as required
What is the purpose of a prompt() dialog box?
Ask the user for information
What type of JavaScript array is displayed below using key/value pairs? var states = new Array(); states["CA"] = "90210"; states["ME"] = "01234"; states["MT"] = "55641"; states["FL"] = "32829";
Associative array
Recursion is a function that __________.
Calls itself
When using the Array object in JavaScript the data types stored in each element of the array must be the same.
False
When using the Math object a programmer MUST create an instance of the JavaScript core object by calling the constructor (i.e. Math math = new Math()).
False
What are logical errors in a JavaScript program?
Faulty logic in JS
Variables declared outside of functions that can be used or changed anywhere in the program are called __________.
Global variables
When using the typeof() function what does a value of null mean?
No valid data type
When calling a declared function setLetter(word, letter, display) how many arguments must be passed for the function to run?
None are required to run, but you may not get the result you wanted
Local variables are declared inside of JavaScript functions and can be used or modified __________.
Only in function they are declared
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
Decision-making constructs for control flow such as if, if/else, if/else if, and switch are called
control expressions
&& and || are called what in JavaScript?
logical operators
