Filter expression with length property

Setup

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

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

Results

Consensus

[]

Other responses

C (json-glib)

Not supported

Unable to compile selector `$[?(@.length == 4)]': Invalid array index definition “?(@.length == 4)]”

Clojure (json-path) ¹

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

Cpp (jsoncons)

[
  [
    1,
    2,
    3,
    4
  ]
]

Golang (github.com-spyzhov-ajson)

[
  [
    1,
    2,
    3,
    4
  ]
]

JavaScript (Goessner) ²

[
  [
    1,
    2,
    3,
    4
  ]
]

JavaScript (brunerd)

[
  [
    1,
    2,
    3,
    4
  ]
]

JavaScript (jsonpath)

[
  [
    1,
    2,
    3,
    4
  ]
]

JavaScript (jsonpath-plus)

[
  [
    1,
    2,
    3,
    4
  ]
]

Kotlin (com.nfeld.jsonpathkt) ¹

Not supported

Unexpected char, char=?, index=2

PHP (galbar-jsonpath) ²

[
  [
    1,
    2,
    3,
    4
  ]
]

Python (jsonpath) ²

[
  [
    1,
    2,
    3,
    4
  ]
]

Python (jsonpath-ng)

Not supported

JsonPathLexerError('Error on line 1, col 2: Unexpected character: ? ')

Python (jsonpath-rw)

Not supported

JsonPathLexerError('Error on line 1, col 2: Unexpected character: ? ')

Python (jsonpath2)

Not supported

line 1:14 extraneous input '=' expecting {'@', '$', 'true', 'false', 'null', '{', '[', STRING, NUMBER}
ValueError("line 1:14 extraneous input '=' expecting {'@', '$', 'true', 'false', 'null', '{', '[', STRING, NUMBER}")

Raku (JSON-Path)

Not supported

Evaluation of embedded Perl 6 code not allowed (construct with :allow-eval)

Ruby (jsonpath)

[
  [
    1,
    2,
    3,
    4
  ]
]

dotNET (JsonCons.JsonPath)

[
  [
    1,
    2,
    3,
    4
  ]
]

dotNET (JsonPath.Net)

[
  [
    1,
    2,
    3,
    4
  ]
]

dotNET (Manatee.Json)

[
  [
    1,
    2,
    3,
    4
  ]
]

JSON (Path_Reference_Implementation)

Not supported

 --> 1:3
  |
1 | $[?(@.length == 4)]
  |   ^---
  |
  = expected unionChild, unionArrayIndex, or sliceStart

Errors

PHP (Goessner) ²

ArgumentCountError

Perl (JSON-Path)

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

Footnotes