Conditionals

• if and case statements return the value of the last expression evaluated
  

If ... else

if expr
  statements
elsif expr
  statements
else
  statements
end

if expr then statements
elsif expr then statements
else statements
end

single-statement if expr

Unless

unless expr
  statements
else
  statements
end

unless expr then statements
else statements

single-statement unless expr

Case

case obj
  when expr
    statements
  when expr
    statements
  else
    statements
end

case obj
  when expr then statements
  when expr then statements
  else statements
end

• Internally uses ===, rather than ==
• Resolves to expr === obj