确定一个对象是否具有与 true 相同的键

Question

我想要一个函数，它接受一系列操作，将其与用户操作列表进行比较，然后返回用户是否可以执行该操作。基本上，给出：const usersActions: { [key: string]: {[key: string]: boolean} } = {      Bob: { eat: false, drink: false, sleep: true, walk: true },      Alice: { eat: true, drink: true, sleep: true, walk: false }};如果 Bob 或 Alice 可以执行一组特定的函数，该函数就会返回。enum Actions{    Eat= 'eat',    Drink= 'drink',    Sleep= 'sleep',    Walk= 'walk'}const verifyActions = (name: string, actions: Array<Actions>) => {    return actions.every((action) => {        return usersActions[name][action];    });}console.log(verifyActions('Bob', [Actions.Eat, Actions.Sleep])); // falseconsole.log(verifyActions('Bob', [Actions.Sleep, Actions.Walk])); // trueconsole.log(verifyActions('Alice', [Actions.Drink, Actions.Eat, Actions.Sleep])); // trueconsole.log(verifyActions('Alice', [Actions.Sleep, Actions.Walk])); // false这完全按照我所描述的方式工作，但我忍不住认为有一种更好的方法可以做到这一点，例如比较数组与对象，也许是 Lodash 的单行代码？这让我的大脑有点困惑，并让我有一种挥之不去的感觉，认为还有更优雅的方法。

Answer 1

您的函数简单易读，只需删除大括号和return：

const usersActions = {

  Bob: { eat: false, drink: false, sleep: true, walk: true },

  Alice: { eat: true, drink: true, sleep: true, walk: false }

};

const Actions = {

  Eat: 'eat',

  Drink: 'drink',

  Sleep: 'sleep',

  Walk: 'walk'

}

const verifyActions = (name, actions) => actions.every((action) => usersActions[name][action]);

console.log(verifyActions('Bob', [Actions.Eat, Actions.Sleep])); // false

console.log(verifyActions('Bob', [Actions.Sleep, Actions.Walk])); // true

console.log(verifyActions('Alice', [Actions.Drink, Actions.Eat, Actions.Sleep])); // true

console.log(verifyActions('Alice', [Actions.Sleep, Actions.Walk])); // false

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.20/lodash.min.js" integrity="sha512-90vH1Z83AJY9DmlWa8WkjkV79yfS2n2Oxhsi2dZbIv0nC4E6m5AbH8Nh156kkM7JePmqD6tcZsfad1ueoaovww==" crossorigin="anonymous"></script>

使用 lodash，您可以从对象中选取所有操作userActions[name]，然后检查是否所有操作都在true使用_.every(). 然而，这并没有使它更具可读性或更短。

const usersActions = {

  Bob: { eat: false, drink: false, sleep: true, walk: true },

  Alice: { eat: true, drink: true, sleep: true, walk: false }

};

const Actions = {

  Eat: 'eat',

  Drink: 'drink',

  Sleep: 'sleep',

  Walk: 'walk'

}

const verifyActions = (name, actions) => _.every(_.pick(usersActions[name], actions))

console.log(verifyActions('Bob', [Actions.Eat, Actions.Sleep])); // false

console.log(verifyActions('Bob', [Actions.Sleep, Actions.Walk])); // true

console.log(verifyActions('Alice', [Actions.Drink, Actions.Eat, Actions.Sleep])); // true

console.log(verifyActions('Alice', [Actions.Sleep, Actions.Walk])); // false

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.20/lodash.min.js" integrity="sha512-90vH1Z83AJY9DmlWa8WkjkV79yfS2n2Oxhsi2dZbIv0nC4E6m5AbH8Nh156kkM7JePmqD6tcZsfad1ueoaovww==" crossorigin="anonymous"></script>