lodash/_baseHas.js

import getPrototype from './_getPrototype';

/** Used for built-in method references. */
var objectProto = Object.prototype;

/** Used to check objects for own properties. */
var hasOwnProperty = objectProto.hasOwnProperty;

/**
 * The base implementation of `_.has` without support for deep paths.
 *
 * @private
 * @param {Object} object The object to query.
 * @param {Array|string} key The key to check.
 * @returns {boolean} Returns `true` if `key` exists, else `false`.
 */
function baseHas(object, key) {
  // Avoid a bug in IE 10-11 where objects with a [[Prototype]] of `null`,
  // that are composed entirely of index properties, return `false` for
  // `hasOwnProperty` checks of them.
  return hasOwnProperty.call(object, key) ||
    (typeof object == 'object' && key in object && getPrototype(object) === null);
}

export default baseHas;