1 delete x? false 2 typeof x = number 3 delete f? true 4 typeof f = undefined 5 delete foo? false 6 typeof foo = number 7 delete func? false 8 typeof func = function 9 delete foo? false 10 typeof foo? number 11 foo = 33 12 x in function = local 13 delete x? = true 14 x after delete = global 15 x = global