set-is-superset-of.js 663 B

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  1. 'use strict';
  2. var aSet = require('../internals/a-set');
  3. var has = require('../internals/set-helpers').has;
  4. var size = require('../internals/set-size');
  5. var getSetRecord = require('../internals/get-set-record');
  6. var iterateSimple = require('../internals/iterate-simple');
  7. // `Set.prototype.isSupersetOf` method
  8. // https://tc39.github.io/proposal-set-methods/#Set.prototype.isSupersetOf
  9. module.exports = function isSupersetOf(other) {
  10. var O = aSet(this);
  11. var otherRec = getSetRecord(other);
  12. if (size(O) < otherRec.size) return false;
  13. return iterateSimple(otherRec.getIterator(), function (e) {
  14. if (has(O, e) === false) return false;
  15. }) !== false;
  16. };