if statement

In Ruby statements are technically expressions.

if <expression>
  <code>
end

if <expression>
  <code1>
else
  <code2>
end

if <expression1>
  <code1>
elsif <expression2>
  <code2>
elsif <expression3>
  <code3>
else
  <code4>
end

if <expression> then <code> end