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

Pick

Use Objexts.keys() to convert given object to an iterable arr of keys. Use .filter() to filter the given arr of keys to the expected arr of picked keys. Use .reduce() to convert the filtered/picked keys back to a object with the corresponding key:value pair.

const pick = (obj, arr) =>
  Object
    .keys(obj)
    .filter((v, i) => arr.indexOf(v) !== -1 )
    .reduce((acc, cur, i) => {
      acc[cur] = obj[cur];
      return acc;
    }, {});

// const object = { 'a': 1, 'b': '2', 'c': 3 };
// pick(object, ['a', 'c']) -> { 'a': 1, 'c': 3 }

// pick(object, ['a', 'c'])['a'] -> 1
// pick(object, ['a', 'c'])['c'] -> 3