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import _includes from './_includes';import _map from './_map';import _quote from './_quote';import _toISOString from './_toISOString';import keys from '../keys';import reject from '../reject';

export default function _toString(x, seen) {  var recur = function recur(y) {    var xs = seen.concat([x]);    return _includes(y, xs) ? '<Circular>' : _toString(y, xs);  };
  //  mapPairs :: (Object, [String]) -> [String]  var mapPairs = function(obj, keys) {    return _map(function(k) { return _quote(k) + ': ' + recur(obj[k]); }, keys.slice().sort());  };
  switch (Object.prototype.toString.call(x)) {    case '[object Arguments]':      return '(function() { return arguments; }(' + _map(recur, x).join(', ') + '))';    case '[object Array]':      return '[' + _map(recur, x).concat(mapPairs(x, reject(function(k) { return /^\d+$/.test(k); }, keys(x)))).join(', ') + ']';    case '[object Boolean]':      return typeof x === 'object' ? 'new Boolean(' + recur(x.valueOf()) + ')' : x.toString();    case '[object Date]':      return 'new Date(' + (isNaN(x.valueOf()) ? recur(NaN) : _quote(_toISOString(x))) + ')';    case '[object Null]':      return 'null';    case '[object Number]':      return typeof x === 'object' ? 'new Number(' + recur(x.valueOf()) + ')' : 1 / x === -Infinity ? '-0' : x.toString(10);    case '[object String]':      return typeof x === 'object' ? 'new String(' + recur(x.valueOf()) + ')' : _quote(x);    case '[object Undefined]':      return 'undefined';    default:      if (typeof x.toString === 'function') {        var repr = x.toString();        if (repr !== '[object Object]') {          return repr;        }      }      return '{' + mapPairs(x, keys(x)).join(', ') + '}';  }}