for vs each

gistfile1.rb

i = "foo"
for i in 1..5 do
  puts i
  j = "bar"
end
i # => 5
j # => "bar"

i = "foo"
(1..5).each do |i|
  puts i
  k = "bar"
end
i # => "foo"
k # => NameError

i = "foo"

for i in 1..5
  lambda {
    puts i
    l = "bar"
  }
end

i # 5 
l # NameError