Flow Control

Flow Controls

If/Else

if customerName == "Fred"
      print "Hello Fred!"
elsif customerName == "John"
      print "Hello John!" 
elsif customername == "Robert"
      print "Hello Bob!"
end

Switch

result = case value
   when match1 then result1
   when match2 then result2
   when match3 then result3
   when match4 then result4
   when match5 then result5
   when match6 then result6
   else result7
end

#
#
#

score = 70

result = case score
   when 0..40 then "Fail"
   when 41..60 then "Pass"
   when 61..70 then "Pass with Merit"
   when 71..100 then "Pass with Distinction"
   else "Invalid Score"
end

puts result

Loops

While

while expression do
    ... ruby code here ...
    break if i == 2
end

Unless & Until

# 1

i = 0
until i == 5
   puts i
   i += 1
end

# 2
puts i += 1 until i == 5

unless — это обратная история if

unless i >= 10
    puts "Student failed"
else
    puts "Student passed"
end

For

# 1

for i in 1..8 do
    puts i
    break if i == 2
end

# 2
for i in 1..8 do puts i end

times

Это альтернатива for

5.times { |i| puts i }

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