source: node_modules/nodemon/lib/utils/clone.js@ 81bc7da

module.exports = clone;

// via http://stackoverflow.com/a/728694/22617
function clone(obj) {
  // Handle the 3 simple types, and null or undefined
  if (null === obj || 'object' !== typeof obj) {
    return obj;
  }

  var copy;

  // Handle Date
  if (obj instanceof Date) {
    copy = new Date();
    copy.setTime(obj.getTime());
    return copy;
  }

  // Handle Array
  if (obj instanceof Array) {
    copy = [];
    for (var i = 0, len = obj.length; i < len; i++) {
      copy[i] = clone(obj[i]);
    }
    return copy;
  }

  // Handle Object
  if (obj instanceof Object) {
    copy = {};
    for (var attr in obj) {
      if (obj.hasOwnProperty && obj.hasOwnProperty(attr)) {
        copy[attr] = clone(obj[attr]);
      }
    }
    return copy;
  }

  throw new Error('Unable to copy obj! Its type isn\'t supported.');
}