使用JQ向键数组添加值

Question

I have a simple JSON array:

[
"smoke-tests",
"other-tests"
]

I'd like to convert to a simple JSON:

{"smoke-tests": true,
 "other-tests": true
}

I've tried several jq examples, but none seem to do what I want.

jq '.[] | walk(.key = true)' jq '.[] | walk(.key = true)' produces a compile error.

Answer 1

$ s='["smoke-tests", "other-tests"]'
$ jq '[.[] | {(.): true}] | add' <<<"$s"
{
  "smoke-tests": true,
  "other-tests": true
}

Breaking down how that works: .[] | {(.): true} .[] | {(.): true} converts each item into a dictionary mapping the value (as a key) to true . Surrounding that in [ ] means we generate a list of such objects; sending that to add combines them into a single object.

Answer 2

如果您喜欢reduce的效率，但是不想显式地使用reduce ：

. as $in | {} | .[$in[]] = true

Answer 3

Here is a solution using add. It's close to Charles 's solution but uses the behavior of Object construction to implicitly return multiple objects when used with an expression which returns multiple results.

 [{(.[]):true}]|add

Answer 4

With reduce() function:

jq 'reduce .[] as $k ({}; .[$k]=true)' file

The output:

{
  "smoke-tests": true,
  "other-tests": true
}