Ruby quiz questions

Which of the following is best described as a block?

1)  my_array = [1, 2, 3]
    my_array.each {|i| puts i*i}
2)  def double(n)
      return n * 2
    end
3)  def welcome
        puts "Welcome to Ruby!"
    end
4)  city = ["London", "Paris", "Belfast", "Rome"]

1. 1

2. 2

3. 3

4. 4

Which of the following correctly sort the array below in descending order?

city = ["London", "Paris", "Belfast", "Rome"]

1. city.sort! do |first, second| second <=> first end

2. city.sort! { |first, second| first <=> second }

3. city.sort! { |first second| second <=> first }

4. city.sort! do |first second| first <=> second end

Which of the the following will be returned from the statement below?

7 % 3 <=> 2+10/2

1. 0

2. 1

3. -1

4. =

Which of the following best describes an argument?

1. The placeholder used when defining a part of method that takes an input

2. The placeholder used when defining a part of method that takes an output

3. The user input when calling a method

4. The user input when creating a method

Which of the following best describes a parameter?

1. The placeholder used when defining a part of method that takes an input

2. The placeholder used when defining a part of method that takes an output

3. The user input when calling a method

4. THe user input when creating a method

Which of the following best describes a method?

1. A section of code that can only e used in objects
   

2. A section of code tha performs a specific task once

3. A section of code that belogs within a hash

4. Reusable section of code written to perform a specific task in a program

Which of following correctly iterates over the hash below printing every key and value?

Address_book {
  "Henry" => "14 Ladbroke Grove"
  "Emily" => "243 Baker Street"
  "Jamie" => "43 Jubilee Street"

1. Address_book.each {|x, y| puts "{x}; {y}" }

    

    

2. Address_book.each {(x, y) puts "{x}; {y}" }

3. Address_book.each [|x, y| puts "#{x};

4. Address_book.each {|x, y| puts "#{x};

Which of the following best describes the next keyword?

1. it can skip over certain iterations in a loop

2. it can only break a loop once

3. it skips to the next loop in the code

4. it incriments a loop by one automatically

Which of the following is the correct syntax for a hash?

1)   hash_name = {
      key1 = value1,
      key2 = value2
     }
2)   hash_name = {
      key1 => value1
      key2 => value2
      end
     }
3)   hash_name = {
      key1 => value1,
      key2 => value2
     }
4)   hash_name = {
      key1 = value1,
      key2 = value2
      end
     }

1. 1

2. 2

3. 3

4. 4

Which of the following correctly accesses 10 from the array below?

array = [12, 10, 12, 14]

1. array [#2]

2. array [1]