初始化

康凯

2022-05-20 aa4c235a8ca67ea8b731f90c951a465e92c0a865

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
'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) {
      if (hasCheck.call(otherSet, value) === false) return iterate.stop();
    }, undefined, false, true).stopped;
  }
});