$$sum

Returns the sum of all values in an array

Usage

{ 
  "$$sum": /* Array to sum */,
  "default": 0 /* BigDecimal */,
  "by": /* Transformer(##current) */
}

"$$sum([default],[by]):{input}"

note

Concrete values in the usage example are default values.

Returns

number (BigDecimal)

Arguments

Argument	Type	Values	Required / Default Value	Description
Primary	array		Yes	Array to sum
default	BigDecimal		0	The default value to use for empty values
by	Transformer(##current)		null	A transformer to extract a property to sum by ##current - Current element

Examples

Input

Definition

Output

[
  4,
  2,
  13.45,
  null
]

"$$sum:$"

19.45

Test

[
  4,
  2,
  13.45,
  null
]

"$$sum(1):$"

20.45

Test

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

"$$sum(1,##current.value):$"

20.45

Test

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

{
  "$$sum": "$",
  "by": "##current.value"
}

19.45

Test

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

{
  "$$sum": "$",
  "by": "##current.value",
  "default": 1
}

20.45

Test