Test case details

Preparation Code

var a = 1, b = true, c = "c", d = [], e = {}, u;

Test cases

Test #1

typeof a === 'undefined'; typeof b === 'undefined'; typeof c === 'undefined'; typeof d === 'undefined'; typeof e === 'undefined';

Test #2

a === undefined; b === undefined; c === undefined; d === undefined; e === undefined;

Test #3

a === u; b === u; c === u; d === u; e === u;

Test #4

!!a !!b !!c !!d !!e