[switch]

switch is a core slot, one of the keywords of the Hyperlambda language, in Hyperlambda, the language of Magic Cloud. Evaluates one of several branches based on the input value.

• Value (switch-value), required: Value to compare against the child [case] values

Arguments

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

Argument	Type	Required	Description
[case]	object	yes	Case branch matching the switch value. Can be repeated.
[case] / any node name	lambda	yes	Branch body executed when the case matches. Can be repeated.
[default]	lambda	no	Fallback branch when no case matches.
[default] / any node name	lambda	yes	Fallback branch body. Can be repeated.

Constraints

• OnlyChildren: Only the listed child names are accepted ([case], [default])

Guide: How to use [switch]

JSON declaration

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

JSON declaration

{
  "name": "switch",
  "description": "Evaluates one of several branches based on the input value",
  "signature": {
    "input": {
      "kind": "switch-value",
      "description": "Value to compare against the child [case] values",
      "required": true,
      "mode": "ValueOrExpression"
    },
    "children": {
      "case": {
        "type": "object",
        "kind": "switch-value",
        "description": "Case branch matching the switch value",
        "required": true,
        "mode": "ValueOrExpression",
        "cardinality": "OneOrMore",
        "role": "Branch",
        "evaluation": "EvalSelf",
        "projection": "Self",
        "children": {
          "*": {
            "type": "lambda",
            "description": "Branch body executed when the case matches",
            "required": true,
            "mode": "ExecutableLambda",
            "cardinality": "OneOrMore",
            "role": "ExecutableBody",
            "evaluation": "EvalSelf",
            "projection": "Self"
          }
        }
      },
      "default": {
        "type": "lambda",
        "description": "Fallback branch when no case matches",
        "required": false,
        "mode": "ExecutableLambda",
        "cardinality": "ZeroOrOne",
        "role": "Branch",
        "evaluation": "EvalSelf",
        "projection": "Self",
        "children": {
          "*": {
            "type": "lambda",
            "description": "Fallback branch body",
            "required": true,
            "mode": "ExecutableLambda",
            "cardinality": "OneOrMore",
            "role": "ExecutableBody",
            "evaluation": "EvalSelf",
            "projection": "Self"
          }
        }
      }
    },
    "constraints": [
      {
        "description": "Only the listed child names are accepted",
        "values": [
          "case",
          "default"
        ],
        "kind": "OnlyChildren"
      }
    ]
  }
}

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