Reducer.contains | /common/reducer.ts | rimbu@1.0.0

Module

x/rimbu/common/reducer.ts>Reducer.contains

Rimbu is a TypeScript library focused on immutable, performant, and type-safe collections and other tools.

rimbu-org/rimbu

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mod.ts (default module)

function Reducer.contains

import { Reducer } from "https://deno.land/x/rimbu@1.0.0/common/reducer.ts";
const { contains } = Reducer;

contains<T>(elem: T, eq?: Eq<T>): Reducer<T, boolean>

Returns a Reducer that outputs false as long as the given elem has not been encountered in the input values, true otherwise.

Examples

Example 1

console.log(Stream.range({ amount: 10 }).reduce(Reducer.contains(5)))
// => true

Type Parameters

Parameters

elem: T

the element to search for

optional

eq: Eq<T> = [UNSUPPORTED]

(optional) a comparison function that returns true if te two given input values are considered equal

Returns

Reducer<T, boolean>