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b2977053/OptionalChaining

Created February 6, 2020 05:56
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OptionalChaining
New in Chrome 80  |  Web  |  Google Developers
https://developers.google.com/web/updates/2020/02/nic80?fbclid=IwAR2nKXVG8kxLpJ2kgwVbLqYiAbEIXvGUMkeiuKFcQczVhgbHJoo470RyFww#opt-chaining
var ABC = function(){this.a = '123'}
ABC.prototype._fun1 = function(){return this.a.length}
ABC.prototype._fun2 = function(){return this.b?.length}
var abc = new ABC();
abc._fun1() // 3
abc._fun2() // undefined
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