$$sum

Returns a sum of all values in the array

Usage

{
  "$$sum": [ /* values */ ],
  "by": /* Transformer */
  "default": /* 0 */
}

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

Returns

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)	Input is ##current (current element)	"##current"	A transformer to extract a property to sum by (using ##current to refer to the current item)

Examples

Input

Definition

Output

[4, 2, 13.45, null]

"$$sum:$"

19.45

[4, 2, 13.45, null]

"$$sum(1):$"

20.45

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

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

19.45

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

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

20.45