Methods

Question 1

How do you allow for multiple, but unknown number of arguments in a method.

Answer 1

Using the splat " * " operator. 
Example: 
def whats_up(greeting, *names) 
    names.each do |name|
    puts "#{greeting},"#{name} 
  end
end

whats_up(‘Hey there’, ‘Timmy’, ‘James’, ‘Ben’)

Question 2

What does the " * " SPLAT operator do in the following?
def whats_up(greeting, *names) 
    names.each do |name|
    puts "#{greeting},"#{name} 
  end
end

Answer 2

It allows for unknown number of arguments.

Question 3

What’s the different between ‘print “String”’ and ‘return “String”’

Answer 3

RETURN stops the code and returns a value, but does not print to screen.
PRINT prints to the screen, but does not stop the code to return anything(implicit return… if last line of code).

Question 4

What's the return/output value of this code? Why?
def add(num1, num2)
    return num1 + num2
   "hello" 
end

add(4, 5)

Answer 4

The return value is 9 because the return breaks out of the block and returns the value ‘num1 + num2’.
The “hello” code does not get executed because the block is exited before then.

Question 5

How are destructive methods usually denoted?

Answer 5

With an exclamation mark. “!”

Question 6

What does the following code do/return?

fruits = [“orange”, “apple”, “banana”, “pear”, “grapes”]
fruits.sort! do |first,second|
second <=> first
end

Answer 6

It returns the fruits array sorted in Descending Alphabetical order.

The <=> ‘combined comparison operator’ returns 0 if the first operand (item to be compared) equals the second, 1 if first operand is greater than the second, and -1 if the first operand is less than the second.

Question 7

How do you sort this array in descending order?

fruits = [“orange”, “apple”, “banana”, “pear”, “grapes”]

Answer 7

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