core-js/modules/esnext.set.is-subset-of.js

'use strict';
var $ = require('../internals/export');
var IS_PURE = require('../internals/is-pure');
var getBuiltIn = require('../internals/get-built-in');
var anObject = require('../internals/an-object');
var aFunction = require('../internals/a-function');
var getIterator = require('../internals/get-iterator');
var iterate = require('../internals/iterate');

// `Set.prototype.isSubsetOf` method
// https://tc39.github.io/proposal-set-methods/#Set.prototype.isSubsetOf
$({ target: 'Set', proto: true, real: true, forced: IS_PURE }, {
  isSubsetOf: function isSubsetOf(iterable) {
    var iterator = getIterator(this);
    var otherSet = anObject(iterable);
    var hasCheck = otherSet.has;
    if (typeof hasCheck != 'function') {
      otherSet = new (getBuiltIn('Set'))(iterable);
      hasCheck = aFunction(otherSet.has);
    }
    return !iterate(iterator, function (value, stop) {
      if (hasCheck.call(otherSet, value) === false) return stop();
    }, { IS_ITERATOR: true, INTERRUPTED: true }).stopped;
  }
});