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Rizky 2020-02-16 11:14:09 +07:00 • committed by GitHub
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1-js/04-object-basics/01-object/article.md
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@ -305,7 +305,7 @@ Later we'll see workarounds for the problem:
1. We'll see how to make an objects treat `__proto__` as a regular property in the chapter [](info:prototype-methods). 1. We'll see how to make an objects treat `__proto__` as a regular property in the chapter [](info:prototype-methods).
2. There's also study another data structure [Map](info:map-set) in the chapter <info:map-set>, which supports arbitrary keys. 2. There's also study another data structure [Map](info:map-set) in the chapter <info:map-set>, which supports arbitrary keys.
## Property existance test, "in" operator ## Property existence test, "in" operator
A notable objects feature is that it's possible to access any property. There will be no error if the property doesn't exist! Accessing a non-existing property just returns `undefined`. It provides a very common way to test whether the property exists -- to get it and compare vs undefined: A notable objects feature is that it's possible to access any property. There will be no error if the property doesn't exist! Accessing a non-existing property just returns `undefined`. It provides a very common way to test whether the property exists -- to get it and compare vs undefined: