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b6285c5922
Add the `in` operator to check if a value is present in a mapping (as a key) or sequence (as an element). This mirrors jq's `in` operator which is defined as the inverse of `has`. Usage: . as $m | "key" | in($m) -- check map key existence . as $m | "value" | in($m) -- check array value membership .[] | select(.type | in(["a","b"])) -- filter by membership Fixes #2322
122 lines
1.4 KiB
Markdown
122 lines
1.4 KiB
Markdown
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## Check key exists in map using variable binding
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Given a sample.yml file of:
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```yaml
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a: 1
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b: 2
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c: 3
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```
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then
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```bash
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yq '. as $m | "a" | in($m)' sample.yml
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```
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will output
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```yaml
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true
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```
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## Check key does not exist in map
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Given a sample.yml file of:
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```yaml
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a: 1
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b: 2
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c: 3
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```
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then
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```bash
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yq '. as $m | "d" | in($m)' sample.yml
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```
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will output
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```yaml
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false
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```
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## Check value exists in array
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Given a sample.yml file of:
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```yaml
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- Tool
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- Food
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- Flower
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```
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then
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```bash
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yq '. as $m | "Food" | in($m)' sample.yml
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```
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will output
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```yaml
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true
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```
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## Check value does not exist in array
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Given a sample.yml file of:
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```yaml
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- Tool
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- Food
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- Flower
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```
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then
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```bash
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yq '. as $m | "Animal" | in($m)' sample.yml
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```
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will output
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```yaml
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false
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```
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## Check in with select on array elements
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Filter items whose type is in the given list
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Given a sample.yml file of:
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```yaml
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- item: Pizza
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type: Food
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- item: Rose
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type: Flower
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- item: Hammer
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type: Tool
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```
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then
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```bash
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yq '.[] | select(.type | in(["Tool", "Food"]))' sample.yml
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```
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will output
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```yaml
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item: Pizza
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type: Food
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item: Hammer
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type: Tool
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```
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## In with variable binding - found
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Given a sample.yml file of:
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```yaml
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a: 1
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b: 2
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c: 3
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```
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then
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```bash
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yq '. as $m | "b" | in($m)' sample.yml
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```
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will output
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```yaml
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true
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```
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## In with variable binding - not found
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Given a sample.yml file of:
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```yaml
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a: 1
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b: 2
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c: 3
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```
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then
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```bash
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yq '. as $m | "z" | in($m)' sample.yml
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```
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will output
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```yaml
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false
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```
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