Reducer.contains | /mod.ts | rimbu@1.2.1

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

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function Reducer.contains

import { Reducer } from "https://deno.land/x/rimbu@1.2.1/mod.ts";
const { contains } = Reducer;

contains<T, T2 extends T = T>(elem: T2, options?: { amount?: number; eq?: Eq<T | T2>; negate?: boolean; }): Reducer<T, boolean>

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

Examples

Example 1

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

Type Parameters

optional

T2 extends T = T

Parameters

elem: T2

the element to search for

optional

options: { amount?: number; eq?: Eq<T | T2>; negate?: boolean; } = [UNSUPPORTED]

(optional) an object containing the following properties:
amount: (detaulf: 1) the amount of elements to find
eq: (default: Eq.objectIs) the Eq instance to use to compare elements
negate: (default: false) when true will invert the given predicate

Returns

Reducer<T, boolean>