gistfile1.rbx

>> for a in [1,2,3]
>>   b = a * 3
>> end
=> [1, 2, 3]
>> [a,b]
=> [3, 9]
>> [1,2,3].each do |c|
?>   d = c * 3
>> end
=> [1, 2, 3]
>> c
NameError: undefined local variable or method `c' for main:Object
	from (irb):8
>> d
NameError: undefined local variable or method `d' for main:Object
	from (irb):9
>>