Reducer | /mod.ts | rimbu@0.14.0

namespace Reducer

Re-export

import { Reducer } from "https://deno.land/x/rimbu@0.14.0/mod.ts";

Classes

Reducer.Base

A base class that can be used to easily create Reducer instances.

Variables

v Reducer.and	Returns a `Reducer` that takes boolean values and outputs true if all input values are true, and false otherwise.
v Reducer.average	A `Reducer` that calculates the average of all given numberic input values.
v Reducer.count	Returns a `Reducer` that remembers the amount of input items provided.
v Reducer.first	Returns a `Reducer` that remembers the first input value.
v Reducer.firstWhere	Returns a `Reducer` that remembers the first input value for which the given `pred` function returns true.
v Reducer.isEmpty	Returns a `Reducer` that outputs true if no input values are received, false otherwise.
v Reducer.last	Returns a `Reducer` that remembers the last input value.
v Reducer.lastWhere	Returns a `Reducer` that remembers the last input value for which the given `pred` function returns true.
v Reducer.max	Returns a `Reducer` that remembers the maximum value of the numberic inputs.
v Reducer.maxBy	Returns a `Reducer` that remembers the maximum value of the inputs using the given `compFun` to compare input values
v Reducer.min	Returns a `Reducer` that remembers the minimum value of the numberic inputs.
v Reducer.minBy	Returns a `Reducer` that remembers the minimum value of the inputs using the given `compFun` to compare input values
v Reducer.nonEmpty	Returns a `Reducer` that outputs true if one or more input values are received, false otherwise.
v Reducer.or	Returns a `Reducer` that takes boolean values and outputs true if one or more input values are true, and false otherwise.
v Reducer.product	A `Reducer` that calculates the product of all given numeric input values.
v Reducer.sum	A `Reducer` that sums all given numeric input values.

Functions

f Reducer.combineArr	Returns a `Reducer` that combines multiple input `reducers` by providing input values to all of them and collecting the outputs in an array.
f Reducer.combineObj	Returns a `Reducer` that combines multiple input `reducers` by providing input values to all of them and collecting the outputs in the shape of the given object.
f Reducer.contains	Returns a `Reducer` that outputs false as long as the given `elem` has not been encountered in the input values, true otherwise.
f Reducer.create	Returns a `Reducer` with the given options:
f Reducer.createMono	Returns a `Reducer` of which the input, state, and output types are the same.
f Reducer.createOutput	Returns a `Reducer` of which the state and output types are the same.
f Reducer.every	Returns a `Reducer` that ouputs true as long as all input values satisfy the given `pred`, false otherwise.
f Reducer.join	Returns a `Reducer` that joins the given input values into a string using the given options.
f Reducer.some	Returns a `Reducer` that ouputs false as long as no input value satisfies given `pred`, true otherwise.
f Reducer.toArray	Returns a `Reducer` that collects received input values in an array, and returns a copy of that array as an output value when requested.
f Reducer.toJSMap	Returns a `Reducer` that collects received input tuples into a mutable JS Map, and returns a copy of that map when output is requested.
f Reducer.toJSObject	Returns a `Reducer` that collects 2-tuples containing keys and values into a plain JS object, and returns a copy of that object when output is requested.
f Reducer.toJSSet	Returns a `Reducer` that collects received input values into a mutable JS Set, and returns a copy of that map when output is requested.

Interfaces

Reducer.Impl

The Implementation interface for a Reducer, which also exposes the internal state type.

type alias Reducer

Re-export

import { type Reducer } from "https://deno.land/x/rimbu@0.14.0/mod.ts";

A Reducer is a stand-alone calculation that takes input values of type I, and, when requested, produces an output value of type O.

Type Parameters

optional

O = I

definition: Reducer.Impl<I, O, unknown>