Deck 8: Manipulating Data in Strings and Arrays

Question 1

Regular expression patterns in JavaScript must begin and end with backward slashes.

Answer 1

False

Question 2

Characters contained in a set of parentheses within a regular expression are referred to as a subexpression or ____.

A) subpattern
B) substring
C) subrule
D) subset

Answer 2

A

Question 3

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

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

Answer 3

D

Question 4

The fromCharCode()method is called a ____ method because it is not used as a method of any string objects (which can be literal strings or variables)in your scripts.

A) local
B) static
C) global
D) dynamic

Question 5

The ____ method converts a text string to uppercase.

A) toUpperCase()
B) toMaxCase()
C) toHigherCase()
D) toTitleCase()

Question 6

The length property counts escape sequences such as \n as two characters.

Question 7

The replace()method is case sensitive.

Question 8

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

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

Question 9

You use ____ classes in regular expressions to treat multiple characters as a single item.

A) expression
B) character
C) pattern
D) metarule

Question 10

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

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

Question 11

To convert a JSON string to a JavaScript object, you use the parse()method of the JSON object.

Question 12

A pattern that matches the beginning or end of a line is called a(n)____.

A) tail
B) metacharacter
C) metastring
D) anchor

Question 13

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

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

Question 14

Regular expression patterns consist of literal characters and ____.

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

Question 15

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

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

Question 16

You can use a text string as a literal value or assign it to a variable.

Question 17

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

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

Question 18

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

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

Question 19

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

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

Question 20

The ____ method converts a text string to lowercase.

A) toMinCase()
B) lowerCase()
C) toLowerCase()
D) toUpperCase()

Question 21

All literal strings and string variables in JavaScript are represented by a(n)____________________ class, which contains methods for manipulating text strings.

Question 23

The ____ method adds one or more elements to the end of an array.

A) pop()
B) push()
C) shift()
D) unshift()

Question 24

To sort elements of an array alphabetically, you use the ____ method.

A) arrange()
B) order()
C) list()
D) sort()

Question 25

To convert a JavaScript object to a JSON string, you use the ____ method.

A) convertToString()
B)json()
C)parse()
D)stringify()

Question 26

List and describe three metacharacters that you can use with JavaScript regular expressions.

Question 27

What are the toString()and toLocaleString()methods used for, and what is the difference between them?

Question 28

The ____________________ method of the String class creates a new string with the first instance of a specified pattern replaced with the value of the text argument.

Question 29

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

Question 30

The ____ method removes and returns the first element from the beginning of an array.

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

Question 31

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

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

Question 32

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

Question 33

Explain how to change the case of a variable's valueusing the toLowerCase() or toUpperCase()method.

Question 34

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

Question 35

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

Question 36

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

Question 37

What is the primary difference between the search()method and the indexOf()method?

Question 38

How can you combine text strings with JavaScript?

Question 39

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

Question 40

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

Question 41

How do you create a character class with JavaScript?