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prune ​

Problem ​

You need to strip null, undefined, empty strings, and empty arrays/objects from a value before serializing or sending it to an API.

Solution ​

Use prune(value) to recursively remove all falsy-null values, returning a clean copy.

ts
import { prune } from '@vielzeug/arsenal';

prune({ a: 1, b: null, c: '', d: { e: undefined, f: 2 } });
// { a: 1, d: { f: 2 } }

prune([1, null, 2, undefined, 3]);
// [1, 2, 3]

Pitfalls ​

  • false and 0 are kept — prune only removes null, undefined, and empty strings/collections.
  • Returns a deep copy — the original is not mutated.