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and

since

patronum 1.11.0

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());