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Optional Chaining in JavaScript Works Differently Than You Think
- Optional chaining in JavaScript allows you to safely navigate through an object's structure without causing errors if a value is missing.
- The ?. operator checks for null or undefined and returns undefined instead of throwing an error.
- Only null and undefined will short-circuit the optional chaining, not other falsy values like 0 or false.
- Optional chaining works for nested objects, stopping the chain if any part is null or undefined.
- You can use optional chaining not just for property access but also to safely call methods or functions that may not exist.
- It is important to note that optional chaining does not convert null or undefined to empty objects but simply stops the chain.
- Nullish coalescing (??) complements optional chaining by only falling back on null or undefined values.
- Combining nullish coalescing with optional chaining provides a safer way to access data with backup values.
- Using ?? and || together in an expression requires parentheses to define evaluation order.
- Optional chaining and nullish coalescing change how JavaScript processes data access, avoiding unexpected behavior and errors.
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