Convert simple array to numeric key and value

Question

I'm really struggling with this simple task. I'm trying to convert this:

[
    "arn:aws:iam::123456789012:role/masters.a.eu.somewhere.com",
    "arn:aws:iam::123456789012:role/masters.b.eu.somewhere.com",
    "arn:aws:iam::123456789012:role/masters.c.eu.somewhere.com"
]

To something like this:

{
    "0": "arn:aws:iam::123456789012:role/masters.a.eu.somewhere.com",
    "1": "arn:aws:iam::123456789012:role/masters.b.eu.somewhere.com",
    "2": "arn:aws:iam::123456789012:role/masters.c.eu.somewhere.com"
}

Using just JQ. I've tried using 'to_entries' but I'm not getting the desired output. Any suggestions appreciated.

Where are a, b and c coming from? Just a for the first element, b for the second etc., or extracted from the URL somehow? — Benjamin W.
– Benjamin W., Commented Feb 15, 2019 at 20:43
Just a for the first, b for the second, c for the third. I've ammended my example with numbered elements as that was as close as I could get with to_entries. Just not the desired format. — anon
– anon, Commented Feb 15, 2019 at 20:46

peak · Accepted Answer · 2019-02-15 21:34:46Z

2

Admittedly this is not obvious, but a very short solution is:

with_entries(.key |= tostring)

A more pedestrian but still perfectly respectable solution would be:

. as $in
| reduce range(0;length) as $i ({}; . + {($i|tostring): $in[$i]})

edited Feb 15, 2019 at 21:34

answered Feb 15, 2019 at 21:29

peak

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2 Comments

hobbs Over a year ago

A maybe slightly more scrutable version (that doesn't depend on the "arrays have number keys, objects have string keys" magic) would be to_entries | map({ (.key | tostring): .value }) | add

anon Over a year ago

Very much appreciated. As you say not obvious but logical now I see it. Upvoted the additional suggestion from hobbs as I can see that being more useful to me down the line with regards additional transformations.

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