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Merge pull request #2929 from Rnbsov/patch-18

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Maybe it should be marked as code
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Ilya Kantor 2022-04-14 06:40:21 +03:00 • committed by GitHub
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1-js/04-object-basics/07-optional-chaining/article.md
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@ -182,7 +182,7 @@ userGuest.admin?.(); // nothing happens (no such method)
Here, in both lines we first use the dot (`userAdmin.admin`) to get `admin` property, because we assume that the `user` object exists, so it's safe read from it.
Then `?.()` checks the left part: if the admin function exists, then it runs (that's so for `userAdmin`). Otherwise (for `userGuest`) the evaluation stops without errors.
Then `?.()` checks the left part: if the `admin` function exists, then it runs (that's so for `userAdmin`). Otherwise (for `userGuest`) the evaluation stops without errors.
The `?.[]` syntax also works, if we'd like to use brackets `[]` to access properties instead of dot `.`. Similar to previous cases, it allows to safely read a property from an object that may not exist.