Object.keys(obj)
and Array.prototype.filter()
to remove the keys for which fn
returns a falsy value.Array.prototype.reduce()
to convert the filtered keys back to an object with the corresponding key-value pairs.const pickBy = (obj, fn) => Object.keys(obj) .filter(k => fn(obj[k], k)) .reduce((acc, key) => ((acc[key] = obj[key]), acc), {});
pickBy({ a: 1, b: '2', c: 3 }, x => typeof x === 'number');
// { 'a': 1, 'c': 3 }
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