#sum

Returns the total of an array of numbers, optionally after a projection.

#sum(array, @x: projection?)

Category Grouping and aggregationValid in Property value

Parameters

Name	Type	Description
array	path | array	The numbers, or elements to project.
projection (optional)	lambda	Selects the number from each element.

Returns

number

Examples

Sum numbers

source.json

{
    "numbers": [ 1, 2, 3, 4 ]
}

transformer.json

{
    "result": "#sum($.numbers)"
}

output.json

{
    "result": 10
}

Try it in the playground →

Sum a property

source.json

{
    "items": [ { "price": 2 }, { "price": 3 } ]
}

transformer.json

{
    "result": "#sum($.items, @x: @x.price)"
}

output.json

{
    "result": 5
}

Try it in the playground →

Related

#average · #min · #max · #reduce