function isArray isArray(thing: unknown): thing is unknown[] Determines if the given value is an array. Acts as a type guard, narrowing the value to unknown[] in branches where the result is true. Examples Example 1 isArray([]); // true isArray([1, 2, 3]); // true isArray("hello"); // false isArray(null); // false isArray({}); // false Parameters thing: unknown Return Type thing is unknown[]