node_modules/locutus/php/math/is_nan.js


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'use strict';

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

module.exports = function is_nan(val) {
  // eslint-disable-line camelcase
  //  discuss at: http://locutus.io/php/is_nan/
  // original by: Onno Marsman (https://twitter.com/onnomarsman)
  //    input by: Robin
  //   example 1: is_nan(NaN)
  //   returns 1: true
  //   example 2: is_nan(0)
  //   returns 2: false

  var warningType = '';

  if (typeof val === 'number' && isNaN(val)) {
    return true;
  }

  // Some errors for maximum PHP compatibility
  if ((typeof val === 'undefined' ? 'undefined' : _typeof(val)) === 'object') {
    warningType = Object.prototype.toString.call(val) === '[object Array]' ? 'array' : 'object';
  } else if (typeof val === 'string' && !val.match(/^[+-]?\d/)) {
    // simulate PHP's behaviour: '-9a' doesn't give a warning, but 'a9' does.
    warningType = 'string';
  }
  if (warningType) {
    throw new Error('Warning: is_nan() expects parameter 1 to be double, ' + warningType + ' given');
  }

  return false;
};
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