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 · Optional Chaining (ES2020) safely accesses properties or calls functions on null or undefined values. Safely accesses nested properties without runtime errors. Eliminates the need for explicit null or undefined checks. Improves code readability and cleanliness. 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:
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