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* Remove extra backtick * Reword explanation of update * Reword explanation of relative update * Change "remaple" to "remain" * Change "clovver" to "clobber" * Reword explanation of update for comment operators * Reword explanation of relative update for comment operators * Change "array" to "expression" * Change "the golangs" to "Golang's" * Change "golangs" to "Golang's" * Change "can durations" to "can add durations" * Change "array scalars" to "arrays" * Change "beit" to "be it" * Fix typo in `eval` tip * Fix typo in header for `has` operation * Add space before pipe in `line` operator example * Fix typos in explanation of deep array merges * Change "is now used" to "is now used." * Change "object," to "object." * Changes "indexes" to "indices" * Remove extraneous copied text from `..` article * Reword explanation of `...` operator * Change "your are" to "you are" * Add link to `string` operator docs in `select` article * Change "is a" to "parameter specifies" in `string` operators article * Change "new line" to "newline" * Change "golang regex" to "Golang's regex" * Change "golang" to "Golang" * Add period * Remove comma in `subtract` article * Remove duplicate number subtraction example * Remove comma in `traverse` operator article * Clarify use of brackets when `read`ing with special characters
71 lines
777 B
Markdown
71 lines
777 B
Markdown
# Has
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This operation returns true if the key exists in a map (or index in an array), false otherwise.
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## Has map key
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Given a sample.yml file of:
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```yaml
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- a: yes
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- a: ~
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- a:
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- b: nope
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```
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then
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```bash
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yq '.[] | has("a")' 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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true
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true
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false
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```
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## Select, checking for existence of deep paths
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Simply pipe in parent expressions into `has`
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Given a sample.yml file of:
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```yaml
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- a:
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b:
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c: cat
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- a:
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b:
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d: dog
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```
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then
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```bash
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yq '.[] | select(.a.b | has("c"))' sample.yml
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```
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will output
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```yaml
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a:
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b:
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c: cat
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```
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## Has array index
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Given a sample.yml file of:
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```yaml
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- []
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- [1]
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- [1, 2]
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- [1, null]
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- [1, 2, 3]
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```
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then
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```bash
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yq '.[] | has(1)' 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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false
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true
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true
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true
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```
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