27 lines
660 B
Markdown
27 lines
660 B
Markdown
---
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title: frozenSet
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tags: array,intermediate
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firstSeen: 2020-10-11T11:52:48+03:00
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lastUpdated: 2020-10-11T11:52:48+03:00
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---
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Creates a frozen `Set` object.
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- Use the `new Set()` constructor to create a new `Set` object from `iterable`.
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- Set the `add`, `delete` and `clear` methods of the newly created object to `undefined`, so that they cannot be used, practically freezing the object.
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```js
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const frozenSet = iterable => {
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const s = new Set(iterable);
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s.add = undefined;
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s.delete = undefined;
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s.clear = undefined;
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return s;
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};
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```
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```js
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frozenSet([1, 2, 3, 1, 2]);
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// Set { 1, 2, 3, add: undefined, delete: undefined, clear: undefined }
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```
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