xor

import { xor } from 'patronum';
// or
import { xor } from 'patronum/xor';

Motivation

Combines multiple stores, returning true if exactly one of them is truthy.

Formulae

$result = xor($first, $second);

$result will be true, if exactly one of the stores is truthy
$result will be false, if all stores are falsy or more than one store is truthy

Arguments

The method receives any amount of arguments.

stores: Array<Store<any>> — Any number of stores to check through XOR

Returns

$result: Store<boolean> — The store contains true if exactly one of the passed stores is truthy, otherwise false

Example

Basic usage

import { createStore } from 'effector';
import { xor } from 'patronum/xor';

const $isOnline = createStore(true);
const $isProcessing = createStore(false);

const $isDisabled = xor($isOnline, $isProcessing);
console.assert(true === $isDisabled.getState());
// $isDisabled === true, because $isOnline === true and $isProcessing === false

const $hasError = createStore(true);
const $result = xor($isOnline, $isProcessing, $hasError);
console.assert(false === $result.getState());
// $result === false, because multiple stores are truthy ($isOnline and $hasError)

Try it