Question 1

When applied to text strings, the term ____________________ refers to the act of extracting characters or substrings from a larger string.

Accepted Answer

parsing

Question 2

Explain the difference between the shift()and unshift()methods of the Array object.

Accepted Answer

To add elements to or remove elements from the beginning of an array, you need to use the  shift( and unshift( methods. The shift( method  removes and returns the first  element from the beginning of an array, whereas the unshift( method  adds one or  more elements to the beginning of an array. You append the shift( method to the name  of the array whose first element you want to remove. You append the unshift( method  to the name of an array and pass to the method a comma-separated list of values for the  elements you want to add. For example, the following code declares and initializes an array  containing the names of five colors, and then uses the shift( and unshift( methods  to change the array contents: 
  var colors = [ "mauve" , "periwinkle" , "silver" , "cherry" ,  "lemon" ]; 
  colors.shift(; // colors value now 
  // ["periwinkle", "silver", "cherry", "lemon"] 
  colors.unshift( "yellow-orange" , "violet" ; 
  // colors value now ["yellow-orange", "violet", 
  // "mauve", "periwinkle", "silver", "cherry", "lemon"] 
The shift( method removes the first color, mauve, from the top of the array and  the unshift( method adds two new colors, yellow-orange and violet, to the top  of the array.

Question 3

The JavaScript String class includes the ____ method, which creates a new string by combining strings that are passed as arguments.

Accepted Answer

A)   strcpy() 
B)   strcat() 
C)   strpst() 
D)   concat()  D

Question 4

Regular expression patterns consist of literal characters and ____.

Accepted Answer

A)   metacharacters
B)   metadata
C)   metabytes
D)   supercharacters

Question 5

You use the ____ method of the String class to split a string into an indexed array.

Accepted Answer

A)   toArray() 
B)   slice() 
C)   split() 
D)   shift()

Question 6

The ____ method constructs a text string from Unicode character codes that are passed as arguments.

Accepted Answer

A)   fromCharCode() 
B)   fromUniCode() 
C)   fromLangCode() 
D)   fromStrCode()

Question 7

What is the difference between the slice()and substring()methods?

Accepted Answer

The answer of What is the difference between the slice()and...

Question 8

The ____ method of the String class returns the position number in a string of the first character in the argument.

Accepted Answer

A)   search() 
B)   charAt() 
C)   indexOf() 
D)   substring()

Question 9

Provide two different regular expressions that return true only when tested against a string consisting of exactly 5 characters.

Accepted Answer

The answer of Provide two different regular expressions that return...

Question 10

The ____ object contains methods and properties for working with regular expressions in JavaScript.

Accepted Answer

A)   Expression
B)   RegExp
C)   StrExp
D)   StringExp

Question 11

The ____ method returns the position number in a string of the first instance of the first character in the pattern argument.

Accepted Answer

A)   charAt( pattern ) 
B)   indexOf( pattern ) 
C)   slice( pattern ) 
D)   search( pattern )

Question 12

_________________________ are patterns that are used for matching and manipulating strings according to specified rules.

Accepted Answer

The answer of _________________________ are patterns that are used for...

Question 13

How can you combine text strings with JavaScript?

Accepted Answer

The answer of How can you combine text strings with...

Question 14

The replace() method is case sensitive.

Accepted Answer

A) True 
 B)False

Question 15

To manipulate arrays in your scripts, you use the methods and length property of the ____ class.

Accepted Answer

A)   Array
B)   String
C)   Matrix
D)   Vector

Question 16

__________ is a data format that represents a JavaScript object as a string.

Accepted Answer

The answer of __________ is a data format that represents...

Question 17

How do you create a character class with JavaScript?

Accepted Answer

The answer of How do you create a character class...

Question 18

How can you match any metacharacters as literal values in a regular expression?

Accepted Answer

The answer of How can you match any metacharacters as...

Question 19

To allow a string to contain an alternate set of substrings, you separate the strings in a regular expression pattern with the ____ metacharacter.

Accepted Answer

A)   $
B)   /
C)   |
D)   &

Question 20

The String class ____ property returns the number of characters in a string.

Accepted Answer

A)   elements
B)   size
C)   length
D)   maxIndex

Exam 8: Manipulating Data in Strings and Arrays