[join]

join is a core slot, one of the keywords of the Hyperlambda language, in Hyperlambda, the language of Magic Cloud. Waits for one or more child [fork] operations to finish before proceeding.

• Returns: Resolves to the completed [fork] child nodes with evaluated body node values and children preserved
• Scope: provides join

Arguments

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

Argument	Type	Required	Description
[fork]	lambda	yes	Fork body to start and wait for; evaluated body node values and children are preserved in the completed fork node. Can be repeated.

Guide: How to use [join]

JSON declaration

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

JSON declaration

{
  "name": "join",
  "description": "Waits for one or more child [fork] operations to finish before proceeding",
  "signature": {
    "children": {
      "fork": {
        "type": "lambda",
        "description": "Fork body to start and wait for; evaluated body node values and children are preserved in the completed fork node",
        "required": true,
        "mode": "ExecutableLambda",
        "cardinality": "OneOrMore",
        "role": "ExecutableBody",
        "evaluation": "SerializeLambda",
        "projection": "Self"
      }
    },
    "scope": {
      "provides": "join"
    },
    "output": {
      "mode": "Lambda",
      "kind": "fork-result-list,node-list",
      "description": "Resolves to the completed [fork] child nodes with evaluated body node values and children preserved"
    }
  }
}

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