Control flow

Question 1

simple ruby control flow.

Answer 1

if condition
  block
elsif condition
  block
else 
  block
end

Question 2

test if value is false.

Answer 2

unless

Question 3

check if 2 values are equal.

Answer 3

==

it should be double equal sign because one equal is used for assignment.

Question 4

check if 2 values are not equal.

Answer 4

!=

Question 5

the logical or boolean operators.

Answer 5

&&&raquo_space; and
||&raquo_space; or
!&raquo_space; not

Question 6

only returns true when both sides are true.

Answer 6

&&

Question 7

returns true if any of the side is true.

Answer 7

||

Question 8

turns true value false and vice versa.

Answer 8

!
ex.
!true 
>> false
!(700 / 10 == 70)
>> false

Question 9

a method that evaluates to true if find a string inside a string.

Answer 9

include
ex.
“I am the guru”.include? “g”
» true

Question 10

what does the method that end with “?” evaluate to?

Answer 10

boolean
ex.
include?
blank?
empty?

Question 11

How to replace letters in string?

Answer 11

gsub
ex.
string_to_change.gsub!(/s/, “th”)

Question 12

give an example of the case conditional statement.

Answer 12

case language
when "JS"
  puts "Websites"
when "Python"
  puts "Science"
when "Ruby"
  puts "Web applications"
else
  puts "I don't know"
end