Path: csiph.com!news.mixmin.net!news.albasani.net!.POSTED!not-for-mail From: Thomas 'PointedEars' Lahn Newsgroups: comp.lang.javascript Subject: Re: check for obj nested prop Date: Wed, 13 May 2020 02:46:09 +0200 Organization: PointedEars Software (PES) Lines: 40 Message-ID: <5384004.DvuYhMxLoT@PointedEars.de> References: <70e81d39-3e56-4366-8d8a-b7366dcfb715@googlegroups.com> Reply-To: Thomas 'PointedEars' Lahn Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7Bit X-Trace: news.albasani.net hmR3Udd474enhjDHwjHYteXbFNaNSgpQjf6GOlax0nEtWqnrylVsn8sJkeZ3D966zdeXPXt3tsSvuagFZWk3Ztmsl8gERcizWWR1Pt1lnhPd+EoOEqBzviOsVCZoYUs9 NNTP-Posting-Date: Wed, 13 May 2020 00:46:10 +0000 (UTC) Injection-Info: news.albasani.net; logging-data="w3sH/BAKa4QBWsHztw0MjYDbF65gltm1aj58dSi8JEWn7IDkHvXTu7cOoWNNTlUfr77asvm3zrGEn/7NW5pVMCcodutTOH1qk4ZzQ2aICMK4yemXqCwpKuIZQKUkDjkr"; mail-complaints-to="abuse@albasani.net" User-Agent: KNode/4.14.10 Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAAGFBMVEXTxa4RFk5dUWANED8PFEfy7+MGBiW+n3ZNF/QuAAACaElEQVQ4jVXUwVOcMBQG8Dc7Rc4PUntdWV2uxjDpGaGeozOp1woar4jd5t/v9wLstMwsA/ntlxdCAgUc1hjTc9/JCZfGoo3wG3HdmdAWrIJRHe7GM/TmpY5VFefuVcAkkPbLIaN8rmPmjloyZxgyR3GuJ4K0AGtJ2htz8o7yqikm759fldQXaMpbDzjKAG+8v+AugVTOPO5DOjLvGtUYQwh0CPjnVMyGd+8/GfUB5nLKJDD2aLDh5HYyMDJGDwQIo2ZmZcKbowNmAdB/AzyFhrmF2MHRb0QJJfaAnwGB6orZhoykLzJtGwF/xpYxI1dswomiUj3gTuAIqCn/4C7cULwGNBtwMTk3Y4LfKB5YUaOKBKYtpplm7u0vip8tU1NWWyI/7XdcSuIDoMt6rVHMWT0DbjHPGqDqZVSa6zleLcUTcIKLoMv3ueJluALtAo9B302zPPlrtiVScRdCjXvVh3e3JpYa/jjkuC9N+LrBMlz/eAN4eQijX2EdLo6c5tGGHwLyHFtXk89dDGHwCVhG9T0S/j55AhRZgkMCmUQXJ49TnS1wnQDvw0eAh9ICeMmEFbCnPMFzjAvsWoEWEFdYEx+S0MoUZ1gT1wId8+AF3Bl2OoEu906AUHx5VLw/gXYg/x84loOah/2UYNrgiwSwGO7RfUzVBbx/kgpckumGOi6QirtD6gkLTitbnxNol47S2jVc2vsN5kPqaAHT8uUdAJM4v/DanjYOwmUjWznGfwB7sGtAtor5BgofDuzaRj4kSQAqDakTsKORa3Q3xKi3gE1fhl71KRMqrdZ2AWNNg/YOhQyrVBnb+i+nEg4bsDA+egAAAABJRU5ErkJggg== X-Face: %i>XG-yXR'\"2P/C_aO%~;2o~?g0pPKmbOw^=NT`tprDEf++D.m7"}HW6.#=U:?2GGctkL,f89@H46O$ASoW&?s}.k+&. On Friday, May 8, 2020 at 12:37:26 AM UTC-5, Andrew Poulos wrote: >> Is there a way to get the check value of an object's nested property >> without first having to test for all the ascendant properties? > > In modern JavaScript Optional Chaining exists: > > ```js > if(obj.a?.b?.c?.d) > ... > ``` > > Details: > > Very nice, thanks. It is also emulated by Babel (7). For example, if (obj?.a) { foo; } becomes var _obj; if ((_obj = obj) == null ? void 0 : _obj.a) { foo; } -- PointedEars FAQ: | | Twitter: @PointedEars2 | Please do not cc me./Bitte keine Kopien per E-Mail.