LoDash:从对象属性数组中获取值数组 [英] LoDash: Get an array of values from an array of object properties

问题描述

我确定它在LoDash文档中，但我似乎找不到正确的组合.

I'm sure it's somewhere inside the LoDash docs, but I can't seem to find the right combination.

var users = [{
      id: 12,
      name: Adam
   },{
      id: 14,
      name: Bob
   },{
      id: 16,
      name: Charlie
   },{
      id: 18,
      name: David
   }
]

// how do I get [12, 14, 16, 18]
var userIds = _.map(users, _.pick('id'));

推荐答案

从v4.x版本开始，您应该使用 :

Since version v4.x you should use _.map:

_.map(users, 'id'); // [12, 14, 16, 18]

这样，它对应于本机 Array .prototype.map 方法(ES2015语法):

this way it is corresponds to native Array.prototype.map method where you would write (ES2015 syntax):

users.map(user => user.id); // [12, 14, 16, 18]

在v4.x之前，您可以使用 _.pluck 相同的方式:

Before v4.x you could use _.pluck the same way:

_.pluck(users, 'id'); // [12, 14, 16, 18]

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