API · Transform
compact()
Remove JavaScript falsy values while preserving every other value unchanged.
Signature
compact(): Exstream<Exclude<T, false | 0 | '' | null | undefined>, C>Example
exstream([0, 1, false, 2, '', null, 3]).compact().valuesSync()
// [1, 2, 3]Behavior
compact() drops exactly false, 0, -0, 0n, '', null, undefined, and NaN, following normal JavaScript truthiness. Values such as empty arrays, empty objects, and the string '0' remain.
It is synchronous, stable, and one-to-zero-or-one: output order is unchanged, no queue is added, and downstream pressure propagates upstream. Record contexts pass through with retained values. Existing record errors pass through and do not participate in the truthiness test.
Errors
compact() has no callback and does not create operator errors. Unhandled record errors and fatal failures retain their normal pipeline behavior.
Forms
Available on streams and reusable pipelines. The standalone form takes the stream directly:
stream.compact()
exstream.pipeline().compact()
exstream.compact(stream)