To check whether the value of any variable is empty.

isEmpty.js

/**
* @param data - any datatype value.
*/

function isEmpty(data) {
  if (typeof data == "number" || typeof data == "boolean") return false;
  if (typeof data == "undefined" || data === null) return true;
  if (typeof data.length != "undefined") return data.length == 0;
  let count = 0;
  for (let i in data) if (data.hasOwnProperty(i)) count++;
  return count == 0;
}