locutus/php/var/isset.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

'use strict';

module.exports = function isset() {
  //  discuss at: https://locutus.io/php/isset/
  // original by: Kevin van Zonneveld (https://kvz.io)
  // improved by: FremyCompany
  // improved by: Onno Marsman (https://twitter.com/onnomarsman)
  // improved by: Rafał Kukawski (https://blog.kukawski.pl)
  //   example 1: isset( undefined, true)
  //   returns 1: false
  //   example 2: isset( 'Kevin van Zonneveld' )
  //   returns 2: true

  var a = arguments;
  var l = a.length;
  var i = 0;
  var undef;

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

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

  return true;
};
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