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javascript/snippets/frozen-set.md

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