The Ruby Erudite Saga Quiz

What does this expression evaluate to?

"Cool".+("io")

Answer explanation

This is another way to concatenate Strings. The previous example actually uses syntactic sugar (a deviation from formal syntax to enhance code readability) and this example uses the strict syntax.

What does this expression print?

my_name = "50 Cent"

my_name = "Miley"

p my_name

Answer explanation

The my_name variable was assigned to the value "50 Cent", but then it was reassigned to the value "Miley". Once the my_name variable is reassigned to "Miley", it loses all knowledge that it used to point to "50 Cent".

Define a method called silly_check() that takes a number argument and returns "The number is less than 5" if the argument is less than 5 and "The number is greater than or equal to 5" otherwise.

name = "clem"

age = 32

Is this array valid?

[name, age]

• Yes

• No

Answer explanation

Yes, variables can be used inside of Arrays.

Which of the following is the correct way to define a class called Car?

• def Car/end

• class Car/end

• create Car/end

What is an instance variable?

• A variable that describes an attribute of an instance of a class and is available to all instance methods of a class.

• A variable that describes an attribute of an instance of a class and is available to both instance and class methods within a class.

What does the following expression print?

if "sam" == "cat"

puts "sam equals cat"

elsif "matt" == "matt"

puts "matt equals matt"

else puts "whatever"

end

Answer explanation

The elsif keyword is used to add additional logical criteria to an if statement and this expression prints "matt equals matt". In this case, the boolean condition following the if statement ("sam" == "cat") evaluates to false, so the code inside the if block is not executed. However, the boolean condition following the elsif statement evaluates to true ("matt" == "matt"), so the code inside the elsif block is executed.

Consider the following code:

class Car

def initialize(name)

@name = name

end

def name=(name)

@name = name

end

def name

@name

end

end

brand = Car.new

Car.new in this example will instantiate a new instance of the Car class.

• True

• False

Consider the following table and SQL query:

What will the SQL query above return?