30-seconds-of-code/snippets/isArrayLike.md

isArrayLike

Checks if the provided argument is array-like (i.e. is iterable).

Use the spread operator (...) to check if the provided argument is iterable inside a try... catch block and the comma operator (,) to return the appropriate value.

const isArrayLike = val =>
  try {return [...val], true; }
  catch (e)  { return false; }
};

isArrayLike(document.querySelectorAll('.className')); // true
isArrayLike('abc'); // true
isArrayLike(null); // false