What are some common mistakes when using optional chaining in JavaScript?
An example of an AI chatbot conversation about common mistakes with optional chaining in JavaScript.
What are some common mistakes when using optional chaining in JavaScript?
One common mistake is assuming that optional chaining will return a default value if the property is undefined.
Can you give me an example of that?
Sure! If you use obj?.property and obj is null or undefined, it will return undefined, not a default value.
What about using it with arrays?
Another mistake is using optional chaining with array indices. For example, arr?.[0] will return undefined if arr is null.
Are there performance concerns with optional chaining?
Yes, excessive use of optional chaining can lead to performance issues, especially in deeply nested structures.
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