Add Freeze An Object, Sorta as a javascript til

javascript/freeze-an-object-sorta.md

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+# Freeze An Object, Sorta
+
+You can freeze a JavaScript object using `Object.freeze` which will help
+enforce some immutability practices. Don't be fooled though, you can still
+modify arrays and objects in the frozen object.
+
+Here is what the docs have to say:
+
+> The Object.freeze() method freezes an object: that is, prevents new
+> properties from being added to it; prevents existing properties from being
+> removed; and prevents existing properties, or their enumerability,
+> configurability, or writability, from being changed, it also prevents the
+> prototype from being changed.
+
+And here is `Object.freeze` in action:
+
+```javascript
+> const things = {one: "two", hello: "world", cats: ["Von Neumann", "Sosa"]}
+undefined
+> Object.freeze(things)
+{one: "two", hello: "world", cats: Array(2)}
+
+> things.one = "three"
+"three"
+> things.dogs = []
+[]
+> delete things.hello
+false
+
+> things
+{one: "two", hello: "world", cats: Array(2)}
+
+> things.cats.push("Sneaky")
+3
+
+> things
+{one: "two", hello: "world", cats: Array(3)}
+```
+
+See the [MDN
+Docs](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze)
+for more details.
+
+h/t Jake Worth