制御構文 - Ruby

fruits = ["apple", "orange", "banana"]

for i in 0..2 do
  puts(fruits[i])
end

flag = true

if flag == true
  puts("true")
elsif flag == false
  puts("false")
else
  puts("error")
end

fruits = "apple"

case fruits
when "apple"
  puts("100円")
when "orange"
  puts("80円")
when "banana"
  puts("60円")
else
  puts("30円")
end

status = false

unless status == true
  puts("false")
end