and

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

Motivation

The method allows to check each passed store for thruthy values. It can be compared with if (a && b && c && d).

Formulae

$result = and(...stores);

$result store contains true if each passed store contains “truthy” values.

Arguments

The method receives any amount of arguments.

...stores: Array<Store<T>> — Each argument must be store with a value of any kind.

Returns

$result: Store<boolean> — The store contains false if at least one passed store in stores contains “falsey” value

Example

const $isAuthorized = createStore(true);
const $isAdmin = createStore(false);
const $orderFinished = createStore(true);

const $showCancelButton = and($isAuthorized, $isAdmin, $orderFinished);
console.assert(false === $showCancelButton.getState());

Try it

Composition

const $showRegisterLink = and(
  not($isAuthorized),
  or($isRegisterInProcess, $isEmailRecovering),
);

Alternative

const $showRegisterLink = combine(
  $isAuthorized,
  $isRegisterInProcess,
  $isEmailRecovering,
  (isAuthorized, isRegisterInProcess, isEmailRecovering) => {
    return !isAuthorized && (isRegisterInProcess || isEmailRecovering);
  },
);
console.assert(false === $showRegisterLink.getState());