Strings

Question 1

What does the indexOf() method do?
a) It returns the last occurrence of a character in a string
b) It returns the first occurrence of a character in a string
c) It returns the middle occurrence of a character in a string
d) It returns the length of the string

Answer 1

b) It returns the first occurrence of a character in a string

Question 2

What does the substring() method return if it is provided with only a start index?
a) The string from the start index to the end
b) The entire string
c) A substring that excludes the start index
d) The string from the middle to the start

Answer 2

a) The string from the start index to the end

Question 3

Which method is used to convert the first letter of a name to uppercase?
a) toUpperCase()
b) charAt()
c) substring()
d) properCase

Answer 3

d) properCase

Question 4

What happens if toUpperCase() is used on a string that is already in uppercase?
a) It throws an exception
b) It converts the string to lowercase
c) It has no effect on the uppercase letters
d) It duplicates the uppercase letters

Answer 4

c) It has no effect on the uppercase letters

Question 5

In the email ‘victoria.ploetz@largecorp.com’, what is the character at index 0?
a) v
b) @
c) p
d) l

Answer 5

a) v

Question 6

How does the substring() method work when passed two parameters?
a) It returns a substring from the first to the second index
b) It returns the whole string
c) It ignores the first parameter
d) It duplicates the string

Answer 6

a) It returns a substring from the first to the second index

Question 7

What is the purpose of properCase() method?
a) It converts the entire string to uppercase
b) It capitalizes the first letter of a string
c) It converts the entire string to lowercase
d) It finds the position of characters in the string

Answer 7

b) It capitalizes the first letter of a string

Question 8

What is the purpose of the toLowerCase() method in email processing?
a) To convert the email to lowercase
b) To capitalize the email
c) To check for special characters
d) To reverse the email

Answer 8

a) To convert the email to lowercase

Question 9

What does the charAt() method do?
a) It returns the character at a specified index
b) It finds the length of a string
c) It concatenates two strings
d) It converts the string to uppercase

Answer 9

a) It returns the character at a specified index