An example of why we use `each` rather than `for` and what semicolon block args do for #ruby IRC

each.rb

foo = :untouched
bar = :untouched

[:touched].each do |foo|
  bar = :touched
end

foo #=> :untouched
bar #=> :touched

each_semicolon.rb

foo = :untouched
bar = :untouched

[:touched].each do |foo; bar|
  bar = :touched
end

foo #=> :untouched
bar #=> :untouched

for.rb

foo = :untouched
bar = :untouched

for foo in [:touched]
  bar = :touched
end

foo #=> :touched
bar #=> :touched