extendscript-es5-shim/Array/isArray.js

a collection of useful es5-shims for Extendscript

/*
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray
*/
if (!Array.isArray) {
  Array.isArray = function(arg) {

    if (arg === void 0 || arg === null) {
      return false;
    }
  	return (arg.__class__ === 'Array');
  };
}