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variable / @typed/fx/Fx

withLatestFromWith

Like {@link withLatestFrom}, but combines the pair with f.

Package version
2.0.0-beta.7
Category
Combining sources
Since
1.0.0

Follow one execution

The combiner runs on source pushes after state initializes; a state update alone emits nothing.

Fx timelinewithLatestFromWith(source, state, label)withLatestFromWith
OperatorwithLatestFromWith(source, state, label)
Read this diagram

Follow each lane from left to right. Events stacked vertically share a tick; the green cursor marks the current time across every lane.

  • A value
    The text inside the pill is the emitted value.
  • Work starts
    The raised chevron starts an inner run (^ in the source).
  • The run returns
    The vertical bar ends this lane’s run.
  • A cause is delivered
    The exclamation mark belongs to this lane.
  • Work is interrupted
    The cross marks cancellation of this run.
  • Current time
    The line and diamond move together across all lanes.
  • Happening now
    A highlighted event is at the current tick.
  • Still ahead
    Muted, dashed values have not happened yet.
  • Time continues
    The lane’s arrow is not a return marker. An empty stretch can be quiet work that is still running.

Illustrated ticks start at 0. At 1×, one illustrated tick takes one second; captions specify real durations when timing matters. A cause or interruption belongs to its lane, and other work may continue. Scroll horizontally to inspect the rest of a long timeline.

It inherits the child right-hand fiber and latest-value lifetime from withLatestFrom; the pure projection adds no failures, services, or resources.

Source implementation · Learn the surrounding model

Compare all Fx timelines →

Import

import { withLatestFromWith } from "@typed/fx/Fx";

Signatures

export declare const withLatestFromWith: {
    <A, B, E2, R2, C>(that: Fx<B, E2, R2>, f: (a: A, b: B) => C): <E, R>(self: Fx<A, E, R>) => Fx<C, E | E2, R | R2>;
    <A, E, R, B, E2, R2, C>(self: Fx<A, E, R>, that: Fx<B, E2, R2>, f: (a: A, b: B) => C): Fx<C, E | E2, R | R2>;
};

Why

withLatestFromWith applies a synchronous projection at each eligible left emission without allocating a public tuple stage. Cardinality and triggering remain those of withLatestFrom.

Ownership and lifetime

It inherits the child right-hand fiber and latest-value lifetime from withLatestFrom; the pure projection adds no failures, services, or resources.

Examples

import { Fx } from "@typed/fx"
const labels = Fx.withLatestFromWith(Fx.fromIterable([1]), Fx.succeed("item"), (n, kind) => `${kind}-${n}`)

Other public imports

These import paths expose the same declaration. Each page retains its own public name and signature.

Source