'use strict';

var typeOf = require('kind-of');

/**
 * Expose `extend`
 */

module.exports = extend;

/**
 * Extend `o` with properties of other `objects`.
 *
 * @param  {Object} `o` The target object. Pass an empty object to shallow clone.
 * @param  {Object} `objects`
 * @return {Object}
 */

function extend(o) {
  if (typeOf(o) !== 'object') { return {}; }
  var args = arguments;
  var len = args.length - 1;

  for (var i = 0; i < len; i++) {
    var obj = args[i + 1];

    if (typeOf(obj) === 'object' && typeOf(obj) !== 'regexp') {
      for (var key in obj) {
        if (obj.hasOwnProperty(key)) {
          o[key] = obj[key];
        }
      }
    }
  }
  return o;
};