lodash/_hasPath.js

import baseCastPath from './_baseCastPath';
import isArguments from './isArguments';
import isArray from './isArray';
import isIndex from './_isIndex';
import isKey from './_isKey';
import isLength from './isLength';
import isString from './isString';

/**
 * Checks if `path` exists on `object`.
 *
 * @private
 * @param {Object} object The object to query.
 * @param {Array|string} path The path to check.
 * @param {Function} hasFunc The function to check properties.
 * @returns {boolean} Returns `true` if `path` exists, else `false`.
 */
function hasPath(object, path, hasFunc) {
  if (object == null) {
    return false;
  }
  var result = hasFunc(object, path);
  if (!result && !isKey(path)) {
    path = baseCastPath(path);

    var index = -1,
        length = path.length;

    while (object != null && ++index < length) {
      var key = path[index];
      if (!(result = hasFunc(object, key))) {
        break;
      }
      object = object[key];
    }
  }
  var length = object ? object.length : undefined;
  return result || (
    !!length && isLength(length) && isIndex(path, length) &&
    (isArray(object) || isString(object) || isArguments(object))
  );
}

export default hasPath;