JS: Test is Object Type 📜

/* xah_is_obj(x) return true if x is object type.
Version: 2023-01-17
 */
const xah_is_obj = (x) => {
 const yy = typeof x;
 return (x !== null) && (yy === "object" || yy === "function");
};

// s------------------------------
// test

[
 {},
 [],
 /./,
 new Date(),
 function f() {},
 (x) => 3,
 new Set(),
 new Map(),
 new WeakMap(),
 new WeakSet(),
 function* () {},
 (function* () {})(),
 JSON,
 Math,
 Error(),
 new Promise(() => {}),
].forEach((x) => {
 console.assert(xah_is_obj(x) === true);
});

[null, 3, 1, Infinity, NaN, "", true, undefined, Symbol()].forEach((x) => console.assert(xah_is_obj(x) === false));