datalogic-rs 4.0.21

A fast, type-safe Rust implementation of JSONLogic for evaluating logical rules as JSON. Perfect for business rules engines and dynamic filtering in Rust applications.
Documentation 
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[
  "# Length operator tests",
  {
    "description": "Length of a basic array",
    "rule": { "length": {"val": "array"} },
    "data": { "array": [1, 2, 3, 4, 5] },
    "result": 5
  },
  {
    "description": "Length of an empty array returns 0",
    "rule": { "length": {"val": "emptyArray"} },
    "data": { "emptyArray": [] },
    "result": 0
  },
  {
    "description": "Length of a string counts characters",
    "rule": { "length": {"val": "str"} },
    "data": { "str": "hello" },
    "result": 5
  },
  {
    "description": "Length of an empty string returns 0",
    "rule": { "length": {"val": "empty"} },
    "data": { "empty": "" },
    "result": 0
  },
  {
    "description": "Length of a Unicode string counts code points correctly",
    "rule": { "length": {"val": "unicode"} },
    "data": { "unicode": "👋🌍" },
    "result": 2
  },
  {
    "description": "Length of missing variable returns null",
    "rule": { "length": {"val": "missing"} },
    "data": {},
    "error": { "type": "Invalid Arguments" }
  },
  {
    "description": "Length operator with null argument throws error",
    "rule": { "length": null },
    "data": {},
    "error": { "type": "Invalid Arguments" }
  },
  {
    "description": "Length operator with numeric argument throws error",
    "rule": { "length": 123 },
    "data": {},
    "error": { "type": "Invalid Arguments" }
  },
  {
    "description": "Length operator with boolean argument throws error",
    "rule": { "length": true },
    "data": {},
    "error": { "type": "Invalid Arguments" }
  },
  {
    "description": "Conditional based on array length (longer than 3)",
    "rule": { "if": [{ ">": [{ "length": {"val": "array"} }, 3] }, "long", "short"] },
    "data": { "array": [1, 2, 3, 4] },
    "result": "long"
  },
  {
    "description": "Conditional based on array length (not longer than 3)",
    "rule": { "if": [{ ">": [{ "length": {"val": "array"} }, 3] }, "long", "short"] },
    "data": { "array": [1, 2, 3] },
    "result": "short"
  },
  {
    "description": "Length of nested array counts top level elements",
    "rule": { "length": {"val": "nestedArray"} },
    "data": { "nestedArray": [[1, 2], [3, 4], [5, 6]] },
    "result": 3
  },
  {
    "description": "Length of array of objects counts objects",
    "rule": { "length": {"val": "objectArray"} },
    "data": { "objectArray": [{"a": 1}, {"b": 2}, {"c": 3}] },
    "result": 3
  }
]