/* */ 
'use strict';
var $ = require("./$"),
    ctx = require("./$.ctx"),
    safe = require("./$.uid").safe,
    $def = require("./$.def"),
    $iter = require("./$.iter"),
    forOf = require("./$.for-of"),
    ENTRIES = safe('entries'),
    FN = safe('fn'),
    ITER = safe('iter'),
    call = require("./$.iter-call"),
    getIterator = $iter.get,
    setIterator = $iter.set,
    createIterator = $iter.create;
function $for(iterable, entries) {
  if (!(this instanceof $for))
    return new $for(iterable, entries);
  this[ITER] = getIterator(iterable);
  this[ENTRIES] = !!entries;
}
createIterator($for, 'Wrapper', function() {
  return this[ITER].next();
});
var $forProto = $for.prototype;
setIterator($forProto, function() {
  return this[ITER];
});
function createChainIterator(next) {
  function Iterator(iter, fn, that) {
    this[ITER] = getIterator(iter);
    this[ENTRIES] = iter[ENTRIES];
    this[FN] = ctx(fn, that, iter[ENTRIES] ? 2 : 1);
  }
  createIterator(Iterator, 'Chain', next, $forProto);
  setIterator(Iterator.prototype, $.that);
  return Iterator;
}
var MapIter = createChainIterator(function() {
  var step = this[ITER].next();
  return step.done ? step : $iter.step(0, call(this[ITER], this[FN], step.value, this[ENTRIES]));
});
var FilterIter = createChainIterator(function() {
  for (; ; ) {
    var step = this[ITER].next();
    if (step.done || call(this[ITER], this[FN], step.value, this[ENTRIES]))
      return step;
  }
});
require("./$.mix")($forProto, {
  of: function(fn, that) {
    forOf(this, this[ENTRIES], fn, that);
  },
  array: function(fn, that) {
    var result = [];
    forOf(fn != undefined ? this.map(fn, that) : this, false, result.push, result);
    return result;
  },
  filter: function(fn, that) {
    return new FilterIter(this, fn, that);
  },
  map: function(fn, that) {
    return new MapIter(this, fn, that);
  }
});
$for.isIterable = $iter.is;
$for.getIterator = getIterator;
$def($def.G + $def.F, {$for: $for});