yq/pkg/yqlib/doc/operators/entries.md

Entries

Similar to the same named functions in jq these functions convert to/from an object and an array of key-value pairs. This is most useful for performing operations on keys of maps.

to_entries Map

Given a sample.yml file of:

{a: 1, b: 2}

then

yq 'to_entries' sample.yml

will output

- key: a
  value: 1
- key: b
  value: 2

to_entries Array

Given a sample.yml file of:

[a, b]

then

yq 'to_entries' sample.yml

will output

- key: 0
  value: a
- key: 1
  value: b

to_entries null

Given a sample.yml file of:

[]

then

yq 'to_entries' sample.yml

will output

[]

from_entries map

Given a sample.yml file of:

{a: 1, b: 2}

then

yq 'to_entries | from_entries' sample.yml

will output

a: 1
b: 2

from_entries with numeric key indices

from_entries always creates a map, even for numeric keys

Given a sample.yml file of:

[a, b]

then

yq 'to_entries | from_entries' sample.yml

will output

0: a
1: b

Use with_entries to update keys

Given a sample.yml file of:

{a: 1, b: 2}

then

yq 'with_entries(.key |= "KEY_" + .)' sample.yml

will output

KEY_a: 1
KEY_b: 2

Custom sort map keys

Use to_entries to convert to an array of key/value pairs, sort the array using sort/sort_by/etc, and convert it back.

Given a sample.yml file of:

{a: 1, c: 3, b: 2}

then

yq 'to_entries | sort_by(.key) | reverse | from_entries' sample.yml

will output

c: 3
b: 2
a: 1

Use with_entries to filter the map

Given a sample.yml file of:

{a: {b: bird}, c: {d: dog}}

then

yq 'with_entries(select(.value | has("b")))' sample.yml

will output

a: {b: bird}