mapKeys

Problem

You need to transform the keys of an object — for example converting snake_case API keys to camelCase for internal use.

Solution

Use mapKeys(obj, mapper) to produce a new object with transformed keys and the same values.

import { mapKeys, camelCase } from '@vielzeug/arsenal';

const apiResponse = { first_name: 'Alice', last_name: 'Smith' };
mapKeys(apiResponse, camelCase);
// { firstName: 'Alice', lastName: 'Smith' }

Pitfalls

• If the mapper produces duplicate keys, last write wins.
• Returns a shallow copy — values are not cloned.

Related

• mapValues
• invert