Add Check If An Object Is Empty With Zod as a JavaScript TIL

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1240 TILs and counting..._
+_1241 TILs and counting..._
 
 ---
 
@@ -385,6 +385,7 @@ _1240 TILs and counting..._
 - [Character Codes from Keyboard Listeners](javascript/character-codes-from-keyboard-listeners.md)
 - [Check Classes On A DOM Element](javascript/check-classes-on-a-dom-element.md)
 - [Check If A Number Is Positive Or Negative](javascript/check-if-a-number-is-positive-or-negative.md)
+- [Check If An Object Is Empty With Zod](javascript/check-if-an-object-is-empty-with-zod.md)
 - [Check If Something Is An Array](javascript/check-if-something-is-an-array.md)
 - [Check The Password Confirmation With Yup](javascript/check-the-password-confirmation-with-yup.md)
 - [Compare The Equality Of Two Date Objects](javascript/compare-the-equality-of-two-date-objects.md)

javascript/check-if-an-object-is-empty-with-zod.md

@@ -0,0 +1,29 @@
+# Check If An Object Is Empty With Zod
+
+Zod is a schema validation library. It can be used to check all sorts of
+properties about the data moving through our system.
+
+Let's look at how to implement a common type of check -- is this object empty?
+
+```javascript
+import {z} from 'zod';
+
+const emptyObjectSchema = z.object({}).strict();
+const isEmpty = (obj: object): boolean => {
+  const result = emptyObjectSchema.safeParse(obj);
+  return result.success;
+}
+
+isEmpty({});
+//=> true
+
+isEmpty({ hello: 'world' });
+//=> false
+```
+
+This `emptyObjectSchema` _strictly_ defines the schema as an empty object
+(`{}`). Without the [`strict()`](https://github.com/colinhacks/zod#strict)
+part, we'd be allowing an object with key-value pairs to quietly pass the
+validation.
+
+[source](https://twitter.com/jbrancha/status/1565728882082385920)