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Viewing file:     esnext.set.is-subset-of.js (1.04 KB)      -rw-r--r--

'use strict';
var $ = require('../internals/export');
var getBuiltIn = require('../internals/get-built-in');
var call = require('../internals/function-call');
var aCallable = require('../internals/a-callable');
var isCallable = require('../internals/is-callable');
var anObject = require('../internals/an-object');
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: true }, {
  isSubsetOf: function isSubsetOf(iterable) {
    var iterator = getIterator(this);
    var otherSet = anObject(iterable);
    var hasCheck = otherSet.has;
    if (!isCallable(hasCheck)) {
      otherSet = new (getBuiltIn('Set'))(iterable);
      hasCheck = aCallable(otherSet.has);
    }
    return !iterate(iterator, function (value, stop) {
      if (call(hasCheck, otherSet, value) === false) return stop();
    }, { IS_ITERATOR: true, INTERRUPTED: true }).stopped;
  }
});