[apply]

apply is a core slot, one of the keywords of the Hyperlambda language, in Hyperlambda, the language of Magic Cloud. Stamps a template lambda with values from child argument nodes, producing one fully-substituted output per [.dp].

• Value (template,lambda-tree), required: Expression selecting the template node or nodes to transform
• Returns: Resolves to the transformed template nodes after applying the supplied arguments

Arguments

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

Argument	Type	Required	Description
any node name	object	no	Template replacement node matched by name; its value and children replace placeholders named {name}. Can be repeated.

Guide: How to use [apply]

JSON declaration

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

JSON declaration

{
  "name": "apply",
  "description": "Stamps a template lambda with values from child argument nodes, producing one fully-substituted output per [.dp]",
  "signature": {
    "input": {
      "kind": "template,lambda-tree",
      "description": "Expression selecting the template node or nodes to transform",
      "required": true,
      "mode": "Expression"
    },
    "children": {
      "*": {
        "type": "object",
        "description": "Template replacement node matched by name; its value and children replace placeholders named {name}",
        "required": false,
        "mode": "Value",
        "cardinality": "ZeroOrMore",
        "role": "Arguments",
        "projection": "ArgumentBag"
      }
    },
    "output": {
      "mode": "Lambda",
      "kind": "applied-template,lambda-object,lambda-tree",
      "description": "Resolves to the transformed template nodes after applying the supplied arguments"
    }
  }
}

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