# Essential Set

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An essential [Set](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set) poorlyfill for legacy browsers.

Only methods are `add`, `delete`, and `has`.

  * CDN via https://unpkg.com/@ungap/essential-set
  * ESM via `import Set from '@ungap/essential-set'`
  * CJS via `const Set = require('@ungap/essential-set')`

Compatible down to IE9, works well with ES5 shim upfront in IE8 (and maybe lower too).

[Live test](https://ungap.github.io/essential-set/test/)