[exists]

exists is a core slot, one of the keywords of the Hyperlambda language, in Hyperlambda, the language of Magic Cloud. Returns true if the specified node or expression exists.

• Value (node-list,single-object), required: Expression selecting the nodes to test for
• Returns: Returns true if the expression resolves to one or more nodes

Guide: How to use [exists]

JSON declaration

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

JSON declaration

{
  "name": "exists",
  "description": "Returns true if the specified node or expression exists",
  "signature": {
    "input": {
      "kind": "node-list,single-object",
      "description": "Expression selecting the nodes to test for",
      "required": true,
      "mode": "Expression"
    },
    "output": {
      "mode": "Value",
      "kind": "boolean",
      "description": "Returns true if the expression resolves to one or more nodes"
    }
  }
}

---

← execute-file

all core slots

filter →