30-seconds-of-code/snippets/upperize.md

title, tags, author, cover, firstSeen

title	tags	author	cover	firstSeen
Uppercase object keys	object	chalarangelo	blog_images/sofia-tram.jpg	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.

const upperize = obj =>
  Object.keys(obj).reduce((acc, k) => {
    acc[k.toUpperCase()] = obj[k];
    return acc;
  }, {});

upperize({ Name: 'John', Age: 22 }); // { NAME: 'John', AGE: 22 }