Files

Question 1

lines = File.readlines(“text.txt”)
line_count = lines.size
text = lines.join
puts “#{line_count} lines”

Answer 1

file implements a readlines method that reads an entire file into an array, line by line.

Question 2

total_characters = text.length

puts “#{total_characters} characters”

Answer 2

characters including white spaces

Question 3

open source

Answer 3

cource code to an application or library is made available publicly for other people to look at and use.

Question 4

local variables

Answer 4

x = 10
puts x
can be used only in the same place it is defined.

Question 5

scope

Answer 5

where a variable can be used

Question 6

global variables

Answer 6

def basic_method
puts $x
end
$x = 10
basic_method

Question 7

object variables

Answer 7

class Square
def initialize(side_length)
@side_length = side_length
end

Question 8

class variables

Answer 8

class Square
def initialize
if defined?(@@number_of_squares)
@@number_of_squares += 1
else
@@number_of_squares = 1
end
end
def self.count
@@number_of_squares
end
end

a = Square.new
b = Square.new
puts Square.count

ouput : 2

Question 9

class Square
def self.test_method
puts "Hello from the Square class!"
end

def test_method
puts "Hello from an instance of class Square!"
end
end
Square.test_method
Square.new.test_method

Answer 9

Hello from the Square class!
Hello from an instance of class Square!