[else-if]

else-if is a core slot, one of the keywords of the Hyperlambda language, in Hyperlambda, the language of Magic Cloud. Evaluates the child lambda when its condition is true and no preceding [if]/[else-if] branch matched.

Arguments

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

Argument	Type	Required	Description
any node name	lambda	yes	Condition node evaluated for truthiness.
[.lambda]	lambda	yes	Executable lambda block.

Constraints

• PreviousSiblingMustBeOneOf: Previous sibling must be one of the listed slot names ([if], [else-if])

Guide: How to use [else-if]

JSON declaration

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

JSON declaration

{
  "name": "else-if",
  "description": "Evaluates the child lambda when its condition is true and no preceding [if]/[else-if] branch matched",
  "signature": {
    "children": {
      "*": {
        "type": "lambda",
        "kind": "boolean",
        "description": "Condition node evaluated for truthiness",
        "required": true,
        "mode": "ExecutableLambda",
        "cardinality": "ExactlyOne",
        "role": "Condition",
        "evaluation": "EvalSelf",
        "projection": "Value"
      },
      ".lambda": {
        "type": "lambda",
        "description": "Executable lambda block",
        "required": true,
        "mode": "ExecutableLambda",
        "cardinality": "ExactlyOne",
        "role": "LambdaBlock",
        "evaluation": "EvalBlock",
        "projection": "Self"
      }
    },
    "constraints": [
      {
        "description": "Previous sibling must be one of the listed slot names",
        "values": [
          "if",
          "else-if"
        ],
        "kind": "PreviousSiblingMustBeOneOf"
      }
    ]
  }
}

---

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