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Fix syntax enumeration in 1.4.7

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Currently, syntax of the 1 and 3 cases is the same.
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Vse Mozhe Buty 2020-10-05 19:59:16 +03:00 • committed by GitHub
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1-js/04-object-basics/07-optional-chaining/article.md
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@ -164,7 +164,7 @@ The `?.` syntax has three forms:
1. `obj?.prop` -- returns `obj.prop` if `obj` exists, otherwise `undefined`.
2. `obj?.[prop]` -- returns `obj[prop]` if `obj` exists, otherwise `undefined`.
3. `obj?.method()` -- calls `obj.method()` if `obj` exists, otherwise returns `undefined`.
3. `obj.method?.()` -- calls `obj.method()` if `obj.method` exists, otherwise returns `undefined`.
As we can see, all of them are straightforward and simple to use. The `?.` checks the left part for `null/undefined` and allows the evaluation to proceed if it's not so.