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variable / @typed/fx/Fx

dropWhile

Alias of skipWhile for Effect parity (dropWhile naming).

Package version
2.0.0-beta.13
Category
Selecting values
Since
1.0.0

Follow one execution

Alias of skipWhile; the diagram uses this export name.

Fx timelinedropWhile shares skipWhile semanticsdropWhile
OperatordropWhile (alias of skipWhile)
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.

See skipWhile for the shared behavior and lifetime contract.

Source implementation · Learn the surrounding model

Compare all Fx timelines →

Import

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

Signatures

export declare const dropWhile: {
    <A>(predicate: (a: A) => boolean): <E, R>(fx: Fx<A, E, R>) => Fx<A, E, R>;
    <A, E, R>(fx: Fx<A, E, R>, predicate: (a: A) => boolean): Fx<A, E, R>;
};

Why

dropWhile provides Effect Stream naming for the same prefix-dropping behavior as skipWhile.

Ownership and lifetime

This alias has exactly skipWhile’s per-run gate and acquires no additional resource.

Examples

import { Fx } from "@typed/fx"
const values = Fx.fromIterable([0, 1]).pipe(Fx.dropWhile((n) => n === 0))

Other public imports

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

Source