[while]

while is a core slot, one of the keywords of the Hyperlambda language, in Hyperlambda, the language of Magic Cloud. Repeats execution while a condition is true.

• Scope: provides while

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.

Guide: How to use [while]

JSON declaration

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

JSON declaration

{
  "name": "while",
  "description": "Repeats execution while a condition is true",
  "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"
      }
    },
    "scope": {
      "provides": "while"
    }
  }
}

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