26 lines
1006 B
JavaScript
26 lines
1006 B
JavaScript
|
'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;
|
||
|
|
}
|
||
|
|
});
|