{
  "name": "strings.join",
  "description": "Concatenates the values yielded by the expression, inserting the separator between adjacent items",
  "signature": {
    "input": {
      "kind": "string-list",
      "description": "Expression yielding the values to join",
      "required": true,
      "mode": "Expression"
    },
    "children": [
      {
        "type": "string",
        "kind": "string-separator",
        "description": "Separator to place between joined values",
        "required": false,
        "mode": "ExecutableLambda",
        "cardinality": "ZeroOrOne",
        "role": "SourceExpression",
        "evaluation": "EvalSelf",
        "projection": "Value"
      }
    ],
    "output": {
      "mode": "Value",
      "kind": "text",
      "description": "Resolves to the joined string"
    }
  }
}