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'use strict';
// https://github.com/tc39/proposal-iterator-helpers
var $ = require('../internals/export');
var iterate = require('../internals/iterate');
var aFunction = require('../internals/a-function');
var anObject = require('../internals/an-object');

$({ target: 'Iterator', proto: true, real: true }, {
  reduce: function reduce(reducer /* , initialValue */) {
    anObject(this);
    aFunction(reducer);
    var noInitial = arguments.length < 2;
    var accumulator = noInitial ? undefined : arguments[1];
    iterate(this, function (value) {
      if (noInitial) {
        noInitial = false;
        accumulator = value;
      } else {
        accumulator = reducer(accumulator, value);
      }
    }, { IS_ITERATOR: true });
    if (noInitial) throw TypeError('Reduce of empty iterator with no initial value');
    return accumulator;
  }
});