Variables & Methods

Question 1

How do you define a variable?

Answer 1

variable_name = value

Question 2

How do I reassign the value of:

variable_name = value

Answer 2

variable_name = other_value

Question 3

What does snake case look like?

Answer 3

this_is_snake_case

Question 4

What does camel case look like?

Answer 4

thisIsCamelCase

Question 5

True or False: Variables can be written in both snake case and in camel case.

Answer 5

True

Question 6

True or False: Variable names should start with a lowercase letter.

Answer 6

True

Question 7

True or False: This is an acceptable name for a variable: 1st_place

Answer 7

False

Variable names should never start with a number.

Question 8

True or False: This is an acceptable name for a variable: end

Answer 8

False

end is a reserved word in Ruby, meaning that it is used for other purposes and cannot be used as a variable name.

Question 9

True or False: This is an acceptable name for a variable: danny’s_age

Answer 9

False

Apostrophes are not allowed in variable names.

Question 10

name=”Richard”
How do I output the following using string interpolation?
“Hello, my name is Richard!”

Answer 10

puts “Hello, my name is #{name}!”

Question 11

What is the difference between puts and print?

Answer 11

puts will output your code and will enter a new line. print will output your code but will not enter a new line.

Question 12

How would you define a method named greeting?

Answer 12

def greeting
  #your code here
end

Question 13

How would you define a method named greeting with the argument of name?

Answer 13

def greeting(name)
  #your code here
end

Question 14

How do you invoke a method?

Answer 14

greeting(“Richard”)

Question 15

True or False: A method can have multiple arguments.

Answer 15

True
Ex:
def greeting(name, date)
end

Question 16

How do you write an optional argument in a method?

Answer 16

def greeting(name="Ruby programmer")
  #your code here
end

Question 17

What does an optional argument do?

Answer 17

If a method is called and no argument is given, it will default to the default value given. This is good when you want to avoid errors.
Ex:
def greeting(name="Ruby programmer")
  puts "Hello, #{name}!"
end

greeting("Richard")
#Will output "Hello, Richard!"

greeting()
#Will output "Hello, Ruby programmer!"

Question 18

True or False: You can use both optional and required arguments for the same method.

Answer 18

True
Ex:
def greeting(name, age=”a secret”)
end

Question 19

True or False: It is okay to define optional arguments before required arguments in a method.

Answer 19

False
Ex:
def greeting (name=”Ruby programmer”, age)
puts “Hello, my name is #{name} and my age is #{age}!”
end
#greeting(24)
#This will error out since the method will think name is 24 and age is not defined

def greeting(age, name="Ruby programmer")
  puts "Hello, my name is #{name} and my age is #{age}!"
end
#greeting(24)
#Will come out as "Hello, my name is Ruby programmer and my age is 24!"
#Should be written like this

Question 20

How is return different from puts/print?

Answer 20

puts/print can show you the value but return will actually give you the value.
Ex:
#puts/print
def greeting
puts “Hello there!”
end
#Will output “Hello there!” but value will be nil

#return
def greeting
  "Hello there!"
end
#Value will be "Hello there!"