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yq/pkg/yqlib/doc/operators/group-by.md

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Group By

This is used to group items in an array by an expression.

Group by field

Given a sample.yml file of:

[{foo: 1, bar: 10}, {foo: 3, bar: 100}, {foo: 1, bar: 1}]

then

yq 'group_by(.foo)' sample.yml

will output

- - [{foo: 1, bar: 10}, {foo: 3, bar: 100}, {foo: 1, bar: 1}]
  - [{foo: 1, bar: 10}, {foo: 3, bar: 100}, {foo: 1, bar: 1}]
- - [{foo: 1, bar: 10}, {foo: 3, bar: 100}, {foo: 1, bar: 1}]

Group by field, with nuls

Given a sample.yml file of:

[{cat: dog}, {foo: 1, bar: 10}, {foo: 3, bar: 100}, {no: foo for you}, {foo: 1, bar: 1}]

then

yq 'group_by(.foo)' sample.yml

will output

- - [{cat: dog}, {foo: 1, bar: 10}, {foo: 3, bar: 100}, {no: foo for you}, {foo: 1, bar: 1}]
  - [{cat: dog}, {foo: 1, bar: 10}, {foo: 3, bar: 100}, {no: foo for you}, {foo: 1, bar: 1}]
- - [{cat: dog}, {foo: 1, bar: 10}, {foo: 3, bar: 100}, {no: foo for you}, {foo: 1, bar: 1}]
  - [{cat: dog}, {foo: 1, bar: 10}, {foo: 3, bar: 100}, {no: foo for you}, {foo: 1, bar: 1}]
- - [{cat: dog}, {foo: 1, bar: 10}, {foo: 3, bar: 100}, {no: foo for you}, {foo: 1, bar: 1}]