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snippets/upperize.md

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+---
+title: Uppercase object keys
+tags: object
+author: chalarangelo
+cover: blog_images/sofia-tram.jpg
+firstSeen: 2023-02-11T05:00:00-04:00
+---
+
+Converts all the keys of an object to upper case.
+
+- Use `Object.keys()` to get an array of the object's keys.
+- Use `Array.prototype.reduce()` to map the array to an object, using `String.prototype.toUpperCase()` to uppercase the keys.
+
+```js
+const upperize = obj =>
+  Object.keys(obj).reduce((acc, k) => {
+    acc[k.toUpperCase()] = obj[k];
+    return acc;
+  }, {});
+```
+
+```js
+upperize({ Name: 'John', Age: 22 }); // { NAME: 'John', AGE: 22 }
+```