8ee50178f3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
621 B
621 B
omitBy
Creates an object composed of the properties the given function returns falsey for. The function is invoked with two arguments: (value, key).
Use Object.keys(obj) and Array.prototype.filter()to remove the keys for which fn returns a truthy value.
Use Array.prototype.reduce() to convert the filtered keys back to an object with the corresponding key-value pairs.
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' }