[try-signal]

try-signal is a core slot, one of the keywords of the Hyperlambda language, in Hyperlambda, the language of Magic Cloud. Invokes a dynamic slot if it exists and ignores missing slots.

• Value (dynamic-slot-name), required: Name of the dynamic slot to try invoking
• Returns: Resolves to the invoked slot’s value result and any returned child nodes

Arguments

Required arguments come first, then the optional ones in the order they are declared.

Argument	Type	Required	Description
any node name	object	no	Named argument passed to the dynamic slot as a child of [.arguments]. Can be repeated.

Returned nodes

Node	Type	Required	Description
any node name	lambda	no	Returned child node produced by the invoked dynamic slot. Can be repeated.

Guide: How to use [try-signal]

JSON declaration

This is the complete declaration of try-signal, as the running system describes it. It is also published as slot.json.

JSON declaration

{
  "name": "try-signal",
  "description": "Invokes a dynamic slot if it exists and ignores missing slots",
  "signature": {
    "input": {
      "kind": "dynamic-slot-name",
      "description": "Name of the dynamic slot to try invoking",
      "required": true,
      "mode": "ValueOrExpression"
    },
    "children": {
      "*": {
        "type": "object",
        "kind": "value",
        "description": "Named argument passed to the dynamic slot as a child of [.arguments]",
        "required": false,
        "mode": "Arguments",
        "cardinality": "ZeroOrMore",
        "role": "Arguments",
        "projection": "ArgumentBag"
      }
    },
    "output": {
      "mode": "Both",
      "kind": "lambda-result",
      "description": "Resolves to the invoked slot's value result and any returned child nodes",
      "children": {
        "*": {
          "type": "lambda",
          "kind": "dynamic-slot-result-node",
          "description": "Returned child node produced by the invoked dynamic slot",
          "required": false,
          "mode": "Value",
          "cardinality": "ZeroOrMore",
          "role": "Payload",
          "projection": "Self"
        }
      }
    }
  }
}

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