pickBy

pickBy() function

Returns a partial copy of an object which contains only the keys that satisfy the supplied predicate.

Signature:

declare function pickBy<T extends object, F extends AsyncEntryPredicate<T>>(f: F, obj: T): Promise<Partial<T>>;

Returns:

Promise<Partial<T>>

Example

const obj = { a: 1, b: "2", c: true };
pickBy(([key, value]) => key === "a" || value === true, obj); // { a: 1, c: true }

// asynchronous predicate
await pickBy(async ([key, value]) => key === "a" || value === true, obj); // { a: 1, c: true }

// Using with the `pipe` function
pipe(
  obj,
  pickBy(([key, value]) => key === "a" || value === true)
);

await pipe(
  obj,
  pickBy(async ([key, value]) => key === "a" || value === true)
);

see pipe, pick,