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Update deepFreeze.md

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fix typo in line 15, and add missing typeof call
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Roni Bar-David
2020-07-20 09:56:30 +03:00
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snippets/deepFreeze.md
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@ -6,13 +6,13 @@ tags: object,recursion,intermediate
Deep freezes an object. Deep freezes an object.
Use `Object.keys()` to get all the properties of the passed object, `Array.prototype.forEach()` to iterate over them. Use `Object.keys()` to get all the properties of the passed object, `Array.prototype.forEach()` to iterate over them.
Call `Object.freeze(obj)` recursively on all properties, checking if each one is frozen using `Object.isFrozen()` and applying `deepFreeze()` as necessary. Call `Object.freeze(obj)` recursively on all properties, checking if each object is frozen using `Object.isFrozen()` and applying `deepFreeze()` as necessary.
Finally, use `Object.freeze()` to freeze the given object. Finally, use `Object.freeze()` to freeze the given object.
```js ```js
const deepFreeze = obj => { const deepFreeze = obj => {
Object.keys(obj).forEach(prop => { Object.keys(obj).forEach(prop => {
if (obj[prop] === 'object' && !Object.isFrozen(obj[prop])) deepFreeze(v[prop]); if (typeof(obj[prop]) === 'object' && !Object.isFrozen(obj[prop])) deepFreeze(obj[prop]);
}); });
return Object.freeze(obj); return Object.freeze(obj);
}; };