How do I access nested properties in a JavaScript object?
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How do I access nested properties in a JavaScript object?
You can access nested properties using dot notation or bracket notation. For example, if you have an object like obj = { a: { b: { c: 1 } } }, you can access c with obj.a.b.c.
What if the property might not exist?
In that case, you can use optional chaining. For example, obj.a?.b?.c will return undefined instead of throwing an error if any property in the chain is missing.
Can you give me an example of using optional chaining?
Sure! If you have let obj = { a: { b: null } }, then obj.a?.b?.c will return undefined without an error.
What about using a default value if the property doesn't exist?
You can use the nullish coalescing operator. For example, obj.a?.b?.c ?? 'default' will return 'default' if c is undefined or null.
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