phpjs/functions/var/isset.js

php.js offers community built php functions in javascript

function isset() {
  // From: http://phpjs.org/functions
  // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   improved by: FremyCompany
  // +   improved by: Onno Marsman
  // +   improved by: Rafał Kukawski
  // *     example 1: isset( undefined, true);
  // *     returns 1: false
  // *     example 2: isset( 'Kevin van Zonneveld' );
  // *     returns 2: true
  var a = arguments,
      l = a.length,
      i = 0,
      undef;

  if (l === 0) {
    throw new Error('Empty isset');
  }

  while (i !== l) {
    if (a[i] === undef || a[i] === null) {
      return false;
    }
    i++;
  }
  return true;
}