[get-first-value]

get-first-value is a core slot, one of the keywords of the Hyperlambda language, in Hyperlambda, the language of Magic Cloud. Returns the first non-null value produced by candidate child nodes.

• Returns: Resolves to the first non-null value produced by the candidate child nodes

Arguments

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

Argument	Type	Required	Description
any node name	lambda	yes	Candidate value source evaluated until the first non-null value is produced. Can be repeated.

Guide: How to use [get-first-value]

JSON declaration

This is the complete declaration of get-first-value, as the running system describes it. It is also published as slot.json.

JSON declaration

{
  "name": "get-first-value",
  "description": "Returns the first non-null value produced by candidate child nodes",
  "signature": {
    "children": {
      "*": {
        "type": "lambda",
        "description": "Candidate value source evaluated until the first non-null value is produced",
        "required": true,
        "mode": "ExecutableLambda",
        "cardinality": "OneOrMore",
        "role": "Operand",
        "evaluation": "EvalSelf",
        "projection": "Value"
      }
    },
    "output": {
      "mode": "Value",
      "description": "Resolves to the first non-null value produced by the candidate child nodes"
    }
  }
}

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