The `?.` operator in JavaScript allows for safe property access by preventing errors when navigating nested objects with unpredictable structures, returning `undefined` instead of throwing an error if any part of the chain is `null` or `undefined`.
JavaScript's global null value allows accessing properties on the global object without throwing an error, leading to unexpected behavior if not handled properly. Understanding how it works can help write more robust code by using strict mode, checking for null/undefined, and leveraging optional chaining.
Optional chaining in JavaScript allows safe navigation through nested objects without null pointer exceptions by using `?.` instead of dot notation, returning undefined instead of throwing an error when encountering a null or undefined value.
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