partition

Operator form: splits the stream into two by a predicate.

Signature

partition(predicate: (value: T, index: number) => boolean): UnaryFunction, [Observable, Observable]>

What it does

Returns a pair of Observables: the first holds values where the predicate is true, the second holds the rest.

When to use

Supporting legacy code. In new code, use the top-level partition(source$, predicate), or two filters for clarity.

See also

filter