set.prototype.issubsetof ^{[![Version Badge][npm-version-svg]][package-url]}

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ES Proposal spec-compliant shim for Set.prototype.isSubsetOf. Invoke its "shim" method to shim Set.prototype.isSubsetOf if it is unavailable or noncompliant.

This package implements the es-shim API interface. It works in an ES3-supported environment, and complies with the proposed spec. When shimmed, it uses es-set to shim the Set implementation itself if needed.

Most common usage:
``js
var assert = require('assert');
var isSubsetOf = require('set.prototype.issubsetof');

var set1 = new Set([1, 2]);
var set2 = new Set([2, 3]);
var set3 = new Set([1]);

assert.equal(isSubsetOf(set1, set2), false);
assert.equal(isSubsetOf(set2, set1), false);
assert.equal(isSubsetOf(set3, set1), true);

isSubsetOf.shim();

assert.equal(set1.isSubsetOf(set2), false);
assert.equal(set2.isSubsetOf(set1), false);
assert.equal(set3.isSubsetOf(set1), true);
`

Tests


Simply clone the repo, npm install, and run npm test`

Set Method Packages

- union
- intersection
- difference
- symmetricDifference
- isSubsetOf
- isSupersetOf
- isDisjointFrom

[package-url]: https://npmjs.com/package/set.prototype.issubsetof
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[testling-svg]: https://ci.testling.com/es-shims/Set.prototype.isSubsetOf.png
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