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 12, 2026 · The Optional Chaining Operator allows a developer to handle many of those cases without repeating themselves by assigning intermediate results in temporary variables: 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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