locutus/php/_helpers/_php_cast_int.js

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

'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 _php_cast_int(value) {
  // eslint-disable-line camelcase
  // original by: Rafał Kukawski
  //   example 1: _php_cast_int(false)
  //   returns 1: 0
  //   example 2: _php_cast_int(true)
  //   returns 2: 1
  //   example 3: _php_cast_int(0)
  //   returns 3: 0
  //   example 4: _php_cast_int(1)
  //   returns 4: 1
  //   example 5: _php_cast_int(3.14)
  //   returns 5: 3
  //   example 6: _php_cast_int('')
  //   returns 6: 0
  //   example 7: _php_cast_int('0')
  //   returns 7: 0
  //   example 8: _php_cast_int('abc')
  //   returns 8: 0
  //   example 9: _php_cast_int(null)
  //   returns 9: 0
  //  example 10: _php_cast_int(undefined)
  //  returns 10: 0
  //  example 11: _php_cast_int('123abc')
  //  returns 11: 123
  //  example 12: _php_cast_int('123e4')
  //  returns 12: 123
  //  example 13: _php_cast_int(0x200000001)
  //  returns 13: 8589934593

  var type = typeof value === 'undefined' ? 'undefined' : _typeof(value);

  switch (type) {
    case 'number':
      if (isNaN(value) || !isFinite(value)) {
        // from PHP 7, NaN and Infinity are casted to 0
        return 0;
      }

      return value < 0 ? Math.ceil(value) : Math.floor(value);
    case 'string':
      return parseInt(value, 10) || 0;
    case 'boolean':
    // fall through
    default:
      // Behaviour for types other than float, string, boolean
      // is undefined and can change any time.
      // To not invent complex logic
      // that mimics PHP 7.0 behaviour
      // casting value->bool->number is used
      return +!!value;
  }
};
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