ReadableBase.prototype.some - Node documentation
method ReadableBase.prototype.some

Usage in Deno

import { ReadableBase } from "node:stream";
ReadableBase.prototype.some(
fn: (
data: any,
options?: Pick<ArrayOptions, "signal">,
) => boolean | Promise<boolean>,
options?: ArrayOptions,
): Promise<boolean>

This method is similar to Array.prototype.some and calls fn on each chunk in the stream until the awaited return value is true (or any truthy value). Once an fn call on a chunk awaited return value is truthy, the stream is destroyed and the promise is fulfilled with true. If none of the fn calls on the chunks return a truthy value, the promise is fulfilled with false.

Parameters

fn: (
data: any,
options?: Pick<ArrayOptions, "signal">,
) => boolean | Promise<boolean>

a function to call on each chunk of the stream. Async or not.

optional
options: ArrayOptions

Return Type

Promise<boolean>

a promise evaluating to true if fn returned a truthy value for at least one of the chunks.