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Filename : set-intersection.js

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'use strict';
var aSet = require('../internals/a-set');
var SetHelpers = require('../internals/set-helpers');
var size = require('../internals/set-size');
var getSetRecord = require('../internals/get-set-record');
var iterateSet = require('../internals/set-iterate');
var iterateSimple = require('../internals/iterate-simple');

var Set = SetHelpers.Set;
var add = SetHelpers.add;
var has = SetHelpers.has;

// `Set.prototype.intersection` method
// https://github.com/tc39/proposal-set-methods
module.exports = function intersection(other) {
  var O = aSet(this);
  var otherRec = getSetRecord(other);
  var result = new Set();

  if (size(O) > otherRec.size) {
    iterateSimple(otherRec.getIterator(), function (e) {
      if (has(O, e)) add(result, e);
    });
  } else {
    iterateSet(O, function (e) {
      if (otherRec.includes(e)) add(result, e);
    });
  }

  return result;
};