phpjs/functions/var/is_binary.js

php.js offers community built php functions in javascript

function is_binary(vr) {
  //  discuss at: http://phpjs.org/functions/is_binary/
  // original by: Brett Zamir (http://brett-zamir.me)
  //   example 1: is_binary('This could be binary as far as JavaScript knows...');
  //   returns 1: true

  return typeof vr === 'string'; // If it is a string of any kind, it could be binary
}