Ruby

Which variable name is valid in Ruby? (Choose one.)

• 3y
• =FALSE()
• _9class
• xyz$
• Pluto

Given the following:

MSG = "hello"

MSG.upcase!

p MSG

What is the correct result? (Choose one.)

• An error occurs because MSG is a constant.

• HELLO is displayed without warning.

• A warning apears because MSG is a constant but HELLO is displayed

• hello is displayed since MSG is a constant.

Which of the following statements are true? (Choose two.):

• Local variables start with a lower case letter, and are two or more characters in length.
• Global variables start with $.
• Instance variables start with *.Constants start with an upper case letter.

Choose one suitable name for the class variable.

• @name
• @@name
• $name
• $$name

Select all correct variable names in Ruby

• @s
• @@s
• @@@s
• $$s

Given the following:

MSG = "hello"

MSG = MSG.upcase

p MSG

What is the correct result? (Choose one.)

• An error occurs because MSG is a constant.

• HELLO is displayed without warning.

• A warning apears because MSG is a constant but HELLO is displayed

• hello is displayed since MSG is a constant.

Which of the following can be inserted into __(1)__ in order to generate the output below? (Choose two.)

$code = "CODE"

__(1)__

• puts "i like writing #{$code}"

• puts "i like writing #$code"

• puts 'i like writing #{$code}'

• puts 'i like writing #$code'

Which of the following can be inserted into __(1)__ in order for the given code to generate the output below? (Choose two.)

puts "$foo$".__(1)__("$", "")

[Output] Foo$

• sub

• chop

• delete

• delete_prefix

Which of the following can be inserted into __(1)__ in order for the given code to generate the output below? (Choose one.)

r = "a".."e" p r.__(1)__

[Output] ["a", "b", "c", "d", "e"]

• array

• to_ary

• to_a

• to_array

Given the following: p "hello ruby world"[6,4] What is the correct result? (Choose one.)

• "hello "
• "ruby"
• " world"
• An error occurs at run-time.