'use strict';

/*
	Deep-clone an object.
*/
function clone(obj) {
  if (obj instanceof Object) {
    var clonedObj = obj instanceof Array ? [] : {};

    for (var i in obj) {
      if (obj.hasOwnProperty(i)) {
        clonedObj[i] = clone(obj[i]);
      }
    }

    return clonedObj;
  }

  return obj;
}

/*
	https://github.com/jonschlinkert/is-plain-object
*/
function isPlainObject(obj) {
  return !!obj && typeof obj === 'object' && obj.constructor === Object;
}

/*
	Shallow-merge two objects.
*/
function shallowMerge(target, source) {
  if (target instanceof Object && source instanceof Object) {
    for (var i in source) {
      if (source.hasOwnProperty(i)) {
        target[i] = source[i];
      }
    }
  }

  return target;
}

module.exports = {
  clone: clone,
  isPlainObject: isPlainObject,
  shallowMerge: shallowMerge,
};