Filter expression with length free function

Setup

Selector: $[?(length(@) == 4)]

[
  [1,2,3,4,5],
  [1,2,3,4],
  [1,2,3]
]

Results

Consensus

Not supported

Other responses

Bash (JSONPath.sh)

[]

Clojure (json-path) ¹

[]

Cpp (jsoncons)

[
  [
    1,
    2,
    3,
    4
  ]
]

Elixir (jaxon)

[]

Golang (github.com-PaesslerAG-jsonpath) ¹

[]

Golang (github.com-bhmj-jsonslice) ¹ ³

[]

Golang (github.com-oliveagle-jsonpath) ¹

[]

Golang (github.com-spyzhov-ajson)

[
  [
    1,
    2,
    3,
    4
  ]
]

JavaScript (jsonpath)

[]

PHP (galbar-jsonpath) ²

Not found

jsonpath returned false, this might indicate an error

Python (jsonpath) ²

Not found

jsonpath returned false, this might indicate an error

Ruby (jsonpath)

[
  [
    1,
    2,
    3,
    4,
    5
  ],
  [
    1,
    2,
    3,
    4
  ],
  [
    1,
    2,
    3
  ]
]

dotNET (JsonCons.JsonPath)

[
  [
    1,
    2,
    3,
    4
  ]
]

dotNET (JsonPath.Net)

[
  [
    1,
    2,
    3,
    4
  ]
]

Errors

JavaScript (Goessner) ²

jsonPath: length is not defined: length(_v) == 4

JavaScript (brunerd)

Invocation violation: (length(@)

JavaScript (jsonpath-plus)

jsonPath: length is not defined: length(@) == 4

PHP (Goessner) ²

ArgumentCountError

PHP (softcreatr-jsonpath)

Error: 'Malformed filter query'

Perl (JSON-Path)

non-safe evaluation, died at main.pl line 11.

Rust (jsonpath_plus)

Error Parsing JSON Path:
$[?(length(@) == 4)]
panic occurred

dotNET (JsonPathLib)

length is not defined

Footnotes

• ¹ This implementation returns a single value where only one match is possible (instead of an array of a single value).
• ² This implementation returns a specific not found value if no match exists.
• ³ This implementation returns a specific not found value if a query that would regularly return a single match results in no match.