1 2 3 4 5 6 7
var a = ['p', 'q', 'r', 's', 't']; var o = {p:1, q:2, r:(1), s:4, t:5}; for (var i in o) { delete o.p; } for (var i of a) assertEq(o.hasOwnProperty(i), i != 'p');