如何选择在jq中作为变量提供的键的值? [英] How to select values of keys that are provided as variables in jq?
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问题描述
如果这是输入,
{
"a_key": 2,
"another_key": 100,
"one_more_key": -4.2
}
通过提供键名称作为变量来选择任何这些键的值的最佳方法是什么?理想情况下,我正在寻找类似的东西:
what would be the best way to select the value of any of these keys by providing the name of the key as a variable? Ideally, I was looking for something like:
"a_key" as $key | .$key
这会导致语法错误(意外的'$'").我想不出一种让jq评估变量的简单方法.
This result in a syntax error, though ("unexpected '$'"). I could not figure out a straightforward way to make jq evaluate the variable.
推荐答案
就像javascript中一样,jq支持索引.您可以按名称访问对象上的属性.
Just like in javascript, jq supports indexing. You can access properties by name on objects.
"a_key" as $key | .[$key]
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