Omit object properties based on function
JavaScript, Object · Oct 21, 2020
Omits the key-value pairs corresponding to the keys of the object for which the given function returns falsy.
- Use
Object.keys()andArray.prototype.filter()to remove the keys for whichfnreturns a truthy value. - Use
Array.prototype.reduce()to convert the filtered keys back to an object with the corresponding key-value pairs. - The callback function is invoked with two arguments: (value, key).
const omitBy = (obj, fn) =>
Object.keys(obj)
.filter(k => !fn(obj[k], k))
.reduce((acc, key) => ((acc[key] = obj[key]), acc), {});omitBy({ a: 1, b: '2', c: 3 }, x => typeof x === 'number'); // { b: '2' }
