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Control flow

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ruby

if cond1
  do_something
elsif cond2
  do_something
else
  do_something
end

unless cond1
  do_something
else
  do_something
end

do_something if cond
do_something unless cond

cond ? was_true : was_false

case my_var
  when 0
    do_something
  when 1
    do_something
  else
    do_something
end