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

select

Retrieve a set of properties indicated by the given selectors from an object.

Use Array.map() for each selector, String.split('.') to split each selector and Array.reduce() to get the value indicated by it.

const select = (from, ...selectors) =>
  [...selectors].map(s => s.split('.').reduce((prev, cur) => prev && prev[cur], from));

const obj = { selector: { to: { val: 'val to select' } } };
select(obj, 'selector.to.val'); // ['val to select']
select(obj, 'selector.to.val', 'selector.to'); // ['val to select', { val: 'val to select' }]