JS: Test If Object is Iterator 💠

By Xah Lee. Date: .
/*
xah_is_iterator(obj) return true if obj is an iterator

Note: this function is not 100% correct. It needs to test if the next function return value is an IteratorResult object.

Version: 2023-01-16
*/
const xah_is_iterator =
  ((x) => (Reflect.has(x, "next") && (typeof x["next"] === "function")));

// HHHH------------------------------
// test

// matchAll return iterator
console.log(
  xah_is_iterator("number 344".matchAll("3")),
);

// array is not an iterator object
console.log(
  xah_is_iterator([3, 4]) === false,
);

JavaScript, Iterable