Each-to-each product

[staneuski]

Hello!

Is there a way to do this kind of array product for all values in the doc:

a: ["A0", "A1", "A2"]
b: ["b0", "b1"]

so the result is:

- ["A0", "b0"]
- ["A1", "b0"]
- ["A2", "b0"]
- ["A0", "b1"]
- ["A1", "b1"]
- ["A2", "b1"]

Thanks!

[polarathene]

You are asking for a function commonly referred to as a Cartesian Product to get that kind of output.

You can do this by using the splat operator (.[]) with variable assignment, then after a pipe operator use the variables in an object/list collection.

---

Examples

List of Lists

$ yq '[.a[] as $a | .b[] as $b | [ $a, $b ]]' data.yaml
- - "A0"
  - "b0"
- - "A0"
  - "b1"
- - "A1"
  - "b0"
- - "A1"
  - "b1"
- - "A2"
  - "b0"
- - "A2"
  - "b1"

Use flow style for single line inner list output

$ yq '[.a[] as $a | .b[] as $b | [ $a, $b ] | . style="flow"]' data.yaml
- ["A0", "b0"]
- ["A0", "b1"]
- ["A1", "b0"]
- ["A1", "b1"]
- ["A2", "b0"]
- ["A2", "b1"]

---

List of Objects

$ yq '[.a[] as $a | .b[] as $b | { "a": $a, "b": $b }]' data.yaml
- a: "A0"
  b: "b0"
- a: "A0"
  b: "b1"
- a: "A1"
  b: "b0"
- a: "A1"
  b: "b1"
- a: "A2"
  b: "b0"
- a: "A2"
  b: "b1"