javascript - JMESPath 中的动态/计算键？

Question

从具有计算属性和Array.reduce / Array.map / Object.assign 的ES2015 开始，您可以执行以下操作：

[{name: 'foo', age: 43}, {name: 'bar', age: 55}].map(
    o => ({[o.name]: o.age})).reduce((a, b) => Object.assign(a,b), {})

......并得到：

{ foo: 43, bar: 55 }

我如何从 JMESPath 获得这个？

试图：

$echo '[{"name": "foo", "age": 43}, {"name": "bar", "age": 55}]' | jp [].{name:age}
[
  {
    "name": 43
  },
  {
    "name": 55
  }
]

score 4 · Accepted Answer

Problem

How to construct a Jmespath query that returns objects with arbitrary key-value pairs
The keys need to be dynamic, based on the output of a jmespath filter expression

As of this writing (2019-03-22), dynamic keys are not available in standard Jmespath
However, it is possible to return a list of lists instead of a list of objects, and simply post-process that list of lists outside of jmespath

 [*].[@.name,@.age]

Returns

[['foo', 43], ['bar', 55]]

Which can then be post-processed outside of Jmespath, if that is an option for you.