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import _cloneRegExp from './_cloneRegExp';import type from '../type';

/** * Copies an object. * * @private * @param {*} value The value to be copied * @param {Array} refFrom Array containing the source references * @param {Array} refTo Array containing the copied source references * @param {Boolean} deep Whether or not to perform deep cloning. * @return {*} The copied value. */export default function _clone(value, refFrom, refTo, deep) {  var copy = function copy(copiedValue) {    var len = refFrom.length;    var idx = 0;    while (idx < len) {      if (value === refFrom[idx]) {        return refTo[idx];      }      idx += 1;    }    refFrom[idx + 1] = value;    refTo[idx + 1] = copiedValue;    for (var key in value) {      copiedValue[key] = deep ?        _clone(value[key], refFrom, refTo, true) : value[key];    }    return copiedValue;  };  switch (type(value)) {    case 'Object':  return copy({});    case 'Array':   return copy([]);    case 'Date':    return new Date(value.valueOf());    case 'RegExp':  return _cloneRegExp(value);    default:        return value;  }}