test.level1.level2.level3 is undefined or not?

undefined.js

var test = {};
var level3 = (((test || {}).level1 || {}).level2 || {}).level3 || 'no key';
console.log( level3 ); // no key

test.level1 = {};
test.level1.level2 = {};
test.level1.level2.level3 = "level3";
level3 = (((test || {}).level1 || {}).level2 || {}).level3;
console.log( level3 ); // "level3"