lo/docs/data/it-sumby.md

name, slug, sourceRef, category, subCategory, signatures, playUrl, variantHelpers, similarHelpers, position

name	slug	sourceRef	category	subCategory	signatures	playUrl	variantHelpers	similarHelpers	position
SumBy	sumby	it/math.go#L74	it	math	func SumBy[T any, R constraints.Float | constraints.Integer | constraints.Complex](collection iter.Seq[T], transform func(item T) R) R		it#math#sumby	core#slice#sumby core#slice#sum	65

Returns the sum of values in the collection using the given transform function.

type Person struct {
    Name string
    Age  int
}

people := it.Slice([]Person{
    {"Alice", 25},
    {"Bob", 30},
    {"Charlie", 35},
})

result := it.SumBy(people, func(p Person) int {
    return p.Age
})
// 90