$$eval

Evaluates the input and then transforms the context with the expression

Usage

{ 
  "$$eval": /* Transformer definition */
}

"$$eval:{input}"

Returns

Any

Arguments

Argument	Type	Values	Required / Default Value	Description
Primary	any		Yes	Transformer definition

Examples

Input

Definition

Output

{
  "a": 42,
  "b": "$.a"
}

"$$eval:$.b"

42

Test

[
  {
    "value": 4
  },
  {
    "value": 2
  },
  {
    "value": 13.45
  },
  {}
]

{
  "$$eval": {
    "$$join": [
      "\\$",
      "$avg:",
      "\\$",
      "..value"
    ]
  }
}

6.483333333333333

Test

[
  {
    "value": 4
  },
  {
    "value": 2
  },
  {
    "value": 13.45
  },
  {
    "value": null
  }
]

{
  "$$eval": {
    "$$jsonparse": "{\"$$avg\":\"$\", \"by\":\"##current.value\"}"
  }
}

4.8625

Test