如何在没有角度循环的情况下从对象数组中获取特定键的所有值答案

【问题标题】：How can i get all values of a particular key from object array without loop in angular如何在没有角度循环的情况下从对象数组中获取特定键的所有值
【发布时间】：2022-01-02 15:50:21
【问题描述】：

[{"time":"2016-07-26 09:02:27","type":"aa"},
{"time":"2016-04-21 20:35:07","type":"ae"},
{"time":"2016-08-20 03:31:57","type":"ar"},
{"time":"2017-01-19 22:58:06","type":"ae"},
{"time":"2016-08-28 10:19:27","type":"ae"},
{"time":"2016-12-06 10:36:22","type":"ar"},
{"time":"2016-07-09 12:14:03","type":"ar"},
{"time":"2016-10-25 05:05:37","type":"ae"},
{"time":"2016-06-05 07:57:18","type":"ae"},
{"time":"2016-10-08 22:03:03","type":"aa"},
{"time":"2016-08-13 21:27:37","type":"ae"},
{"time":"2016-04-09 07:36:16","type":"ar"},
{"time":"2016-12-30 17:20:08","type":"aa"},
{"time":"2016-03-11 17:31:46","type":"aa"},
{"time":"2016-05-04 14:08:25","type":"ar"},
{"time":"2016-11-29 05:21:02","type":"ar"},
{"time":"2016-03-08 05:46:01","type":"ar"},
]

这里我只想键入键所有值

这样请帮我这样做，提前谢谢大家。

【问题讨论】：

如果不循环遍历数组，您将无法做到这一点。但是，如果您正在寻找一些特定的用例，请同时添加您的用例。
使用Array#map:myArray.map(item => item.type)。请注意，数组仍在隐式循环中。
你可以使用map方法。

标签： arrays json angular object

【解决方案1】：

最简单的方法是像这样使用Array.map 方法：

let array = [{"time":"2016-07-26 09:02:27","type":"aa"},
  {"time":"2016-04-21 20:35:07","type":"ae"},
  {"time":"2016-08-20 03:31:57","type":"ar"},
  {"time":"2017-01-19 22:58:06","type":"ae"},
  {"time":"2016-08-28 10:19:27","type":"ae"},
  {"time":"2016-12-06 10:36:22","type":"ar"},
  {"time":"2016-07-09 12:14:03","type":"ar"},
  {"time":"2016-10-25 05:05:37","type":"ae"},
  {"time":"2016-06-05 07:57:18","type":"ae"},
  {"time":"2016-10-08 22:03:03","type":"aa"},
  {"time":"2016-08-13 21:27:37","type":"ae"},
  {"time":"2016-04-09 07:36:16","type":"ar"},
  {"time":"2016-12-30 17:20:08","type":"aa"},
  {"time":"2016-03-11 17:31:46","type":"aa"},
  {"time":"2016-05-04 14:08:25","type":"ar"},
  {"time":"2016-11-29 05:21:02","type":"ar"},
  {"time":"2016-03-08 05:46:01","type":"ar"},
]

array = array.map(i => i.type);
// ["ae", "ar", ...]

array = array.map(i => {return { type: i.type }})
// [ {"type": "ae"}, {"type": "ar"}, ... ]

【讨论】：