Resource Orchestration Service:Fn::Length

Declaration

• JSON

  {
   "Fn::Length": Object
  }

• YAML

  • Syntax for the full function name:

    Fn::Length : Object

  • Syntax for the short form:

    !Length Object

Parameters

Object: the object in which you want to calculate the number of elements. The object supports the String, List, or Dictionary type.

Return value

The number of elements in the object. The value is of the Integer type.

Examples

!Length
  key1: v1
  key2: v2

{
  "Fn:Length": {
    "key1": "v1",
    "key2": "v2"
  }
}

!Length
 - 1
 - 2
 - 3

{
  "Fn:Length": [1,2,3]
}

!Length aaaaaa

{
  "Fn::Length": "aaaaaa"
}