Web Reference: Jul 8, 2025 · The optional chaining (?.) operator accesses an object's property or calls a function. If the object accessed or function called using this operator is undefined or null, the expression short circuits and evaluates to undefined instead of throwing an error. Jan 7, 2020 · Optional chaining isn't just a TypeScript thing - it is a finished proposal in plain JavaScript too. It can be used with bracket notation like above, but it can also be used with dot notation property access: The optional chaining ?. is not an operator, but a special syntax construct, that also works with functions and square brackets. For example, ?.() is used to call a function that may not exist.
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