Add assertValidKeys

snippets/assertValidKeys.md

@@ -0,0 +1,20 @@
+---
+title: assertValidKeys
+tags: object,intermediate
+firstSeen: 2021-07-18T05:00:00-04:00
+---
+
+Validates all keys in an object match the given `keys`.
+
+- Use `Object.keys()` to get the keys of the given object, `obj`.
+- Use `Array.prototype.every()` and `Array.prototype.includes()` to validate that each key in the object is specified in the `keys` array.
+
+```js
+const assertValidKeys = (obj, keys) =>
+  Object.keys(obj).every(key => keys.includes(key));
+```
+
+```js
+assertValidKeys({ id: 10, name: 'apple' }, ['id', 'name']); // true
+assertValidKeys({ id: 10, name: 'apple' }, ['id', 'type']); // false
+```