commands.txt

IRB exercises
Each Ruby command will return a value. Sometimes, these values are not what we expect.

Try the following Commands:

string = "Hello World"
=> fill_in_what_irb_returns_here

string.reverse
=> fill_in_what_irb_returns_here

string
=> fill_in_what_irb_returns_here

array = [3,1,2]
=> fill_in_what_irb_returns_here

array.sort
=> fill_in_what_irb_returns_here

array
=> fill_in_what_irb_returns_here

array.sort!
=> fill_in_what_irb_returns_here

array
=> fill_in_what_irb_returns_here

=> What do you think the exclamation mark indicates?

puts "Hello Ruby"
=> fill_in_what_irb_returns_here

array = [1,2,3,4]
=> fill_in_what_irb_returns_here

array.each do |e|
  e**2
end
=> fill_in_what_irb_returns_here

array.each { |e| e**2 }
=> fill_in_what_irb_returns_here

array
=> fill_in_what_irb_returns_here

array.map do |e|
  e**2
end
=> fill_in_what_irb_returns_here

array
=> fill_in_what_irb_returns_here

array = [1,2,3]

array.inject(0) do |sum, e|
  sum += e
  sum
end
=> fill_in_what_irb_returns_here

array
=> fill_in_what_irb_returns_here

array.reject do |e|
  e > 2
end
=> fill_in_what_irb_returns_here

array
=> fill_in_what_irb_returns_here