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Raimonds Plume
Raimonds Plume

Reputation: 189

Change each json object key(fn) value with number multiplied with 2

Hello I want to change each json object key value. JSON - 

abc='[{"fn": 1,"name":"raimonds"},{"fn": 2,"name":"john"}]'

Now using some filter in jq - 

res=$(echo "$abc" | jq 'map(if .fn then . + {"fn":22222} else . end)')

Now if I'm echoing $res it retuns -

'[{"fn": 22222,"name":"raimonds"},{"fn": 22222,"name":"john"}]'

I want to multiply each fn by 2 and output it like this - 

abc='[{"fn": 22222,"name":"raimonds"},{"fn": 44444,"name":"john"}]'

How can i do that? Thank you!

Upvotes: 1

Views: 288

Answers (2)

janos
janos

Reputation: 124734

Given:

res='[{"fn": 22222,"name":"raimonds"},{"fn": 22222,"name":"john"}]'

As @chepner pointed out, you could modify the object in a filter:

echo "$res" | jq '.[].fn *= 2'

Output:

[
  {
    "fn": 44444,
    "name": "raimonds"
  },
  {
    "fn": 44444,
    "name": "john"
  }
]

My original suggestion was to construct objects with the modified property, which would quickly get tedious, and has no advantages whatsoever:

echo "$res" | jq '[ .[] | {fn: (.fn * 2), name: .name} ]'

Upvotes: 1

jq170727
jq170727

Reputation: 14695

This filter multiplies the .fn member of each object within an array (or another object) by 2, leaving other members unchanged.

.[].fn *= 2

Try it online at jqplay.org

Upvotes: 0

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