[strings.substring]

strings.substring is a slot in the strings namespace, in Hyperlambda, the language of Magic Cloud. Extracts a portion of a string starting at the given offset and optional length; out-of-range bounds throw.

• Value (text), required: Text to transform
• Returns: Resolves to the extracted substring

Arguments

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

Argument	Type	Required	Description
unnamed child node	int	yes	Start index.
unnamed child node	int	no	Optional length.

Guide: How to use [strings.substring]

JSON declaration

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

JSON declaration

{
  "name": "strings.substring",
  "description": "Extracts a portion of a string starting at the given offset and optional length; out-of-range bounds throw",
  "signature": {
    "input": {
      "kind": "text",
      "description": "Text to transform",
      "required": true,
      "mode": "ValueOrExpression"
    },
    "children": [
      {
        "type": "int",
        "kind": "substring-arg",
        "description": "Start index",
        "required": true,
        "mode": "ExecutableLambda",
        "cardinality": "ExactlyOne",
        "role": "SourceExpression",
        "evaluation": "EvalSelf",
        "projection": "Value"
      },
      {
        "type": "int",
        "kind": "substring-arg",
        "description": "Optional length",
        "required": false,
        "mode": "ExecutableLambda",
        "cardinality": "ZeroOrOne",
        "role": "SourceExpression",
        "evaluation": "EvalSelf",
        "projection": "Value"
      }
    ],
    "output": {
      "mode": "Value",
      "kind": "text",
      "description": "Resolves to the extracted substring"
    }
  }
}

---

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all strings.* slots

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