32 lines
890 B
JavaScript
32 lines
890 B
JavaScript
|
'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;
|
||
|
|
};
|