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

renameKeys

Renames multiple object keys

Get the object's keys with Object.keys() and return an object with the new keys, according to the keysMap, using Array.reduce().

The initial value is an empty object which is used as the accumulator, acc, in the callback function. Using the spread operator (...), acc is continuously merged with a new object containing the new key and original object's value. If a new key doesn't exist, fallback to original object's key.

const renameKeys = (keysMap, obj) => Object
    .keys(obj)
    .reduce((acc, key) => ({
        ...acc,
        ...{ [keysMap[key] || key]: obj[key] }
    }), {});

const obj = { name: 'Bobo', job: 'Front-End Master', shoeSize: 100 };
renameKeys({ name: 'firstName', job: 'passion' }, obj);
// { firstName: 'Bobo', passion: 'Front-End Master', shoeSize: 100 }